I was about to post something similar, but saw this thread, so I'll post in here instead.
I think it's very important to be introspective about the actual cause of any behavior that is negative, so you understand the root of the problem, instead of only trying to (and often failing to) control the symptoms.
Ultimately, a keyboard is just a tool you use to interface with your computer, and if you are happy with its layout, ergonomics, and performance, then mission accomplished. All the other stuff that people in this community spend so much time obsessing over--that's just niche hobby stuff that's completely superfluous from the actual intended use of a keyboard, and have very little meaningful effect on what you actually do with the keyboard/computer. Would you want to be the guy with thousands of dollars worth of expensive keyboards but never does anything meaningful with them, or the guy with a cheap standard rubber dome keyboard but codes awesome software, or makes kickass music and videos, or writes amazing novels and screenplay on that keyboard?
Think about what's causing your anxiety with "missing out" on group buys, or must have the latest and greatest, or the need to hoard a collection. Does it have anything to do with negative personality traits that you'd like to eradicate? Is it insecurity? Emptiness? low self-esteem? Lack of meaning in your life? Self-loathing? The need to instant gratification? Avoiding more important things in your life because they are much harder to accomplish/deal with? When you can home in on the real cause of your behavior, it'll be a lot easier to control your behavior and change your mentality.
For me personally, I knew from the start when I fell into this rabbit hole that I'll be climbing out of it in probably a month or so (I even said so when I first joined), and it's taking a bit longer than I predicted, but I'm climbing my way out of it one step at a time. I've now got a concrete plan, and although I'll end up with more keyboards than I anticipated, I'm okay with that because I know exactly why I want each of them, feel that they are worth having, and I won't dwell on them, or turn this into a long-term hobby. I came into GH with the intention of doing my homework and accomplish my mission of finding the ideal keyboard for me, and once the mission is completed, that's it. That doesn't mean I will just stop paying attention completely, since I'm just a fan of tech gadgets in general, and "enjoy" finding out about new products and new trends. For example, I do photography and music, and I have lots of audio gear and photography gear, but I buy only what I actually need to create the kind of work I want to create, and I don't continue to buy stuff just to satisfy some kind of hobbyists collector's urge--I don't have that hoarding element in my personality trait (well, maybe a little, but not enough to be a real problem. I usually sell what I no longer need, and can be quite pragmatic). Even though I don't continue to buy stuff, I'm still subscribed to newsletters from photography/camera and audio sites like dpreview.com, innerfidelity.com, head-fi.com, etc. I simply like to learn about new stuff coming out, and if I see anything that can do a much better job than I what I currently have and it's worth the upgrade, I'll go for it.
I think a great way to assess whether a hobby is really worth it, is to look at what it costs versus the amount of joy you get out of it, and then compare it to another hobby/passion you have. For example, let's say you love video games, or is a big movie buff, or you love music. Look at the amount of money you spend on those hobbies versus the amount of joy you get from them, how much time they occupy in your life, how much energy you spend on them, etc. Now do the same for your keyboard hobby. Does it look like the time and money you spend on keyboards will actually get you more joy if you were to spend them on the other hobbies/passions you have? If you truly get a lot of joy out of keyboards, and you have no other important hobbies or serious aspirations and responsibilities, then good for you--enjoy yourself.
Speaking of serious responsibility and aspirations you might have in your life--are you spending the time/energy/money you should spend on them on keyboards instead? Do you have a family to take care of? Are you saving up for something meaningful/important? Do you have a retirement plan in place? Are you actively investing your money wisely (and I don't mean a savings account--I mean actual investing (IRA, stocks, index funds, mutual funds, real estate, bitcoins, gold, oil, gas, whatever), where the you to at least get significantly greater returns than the rate of inflation, and ideally double or triple it). And if you have serious aspirations in your life, then would the time/energy/money spent on keyboards be better spent on your aspirations (become a successful software developer, make indie games, write/direct a feature film, a music career as a musical artist, solve mankind's most pressing problems like the environment, human rights, cancer, etc). If you have serious aspirations, shouldn't you focus on those instead of keyboards? (My current serious aspiration is to become a novelist with a steady career, and that was one of the main reasons I started researching keyboards--I needed a better typing experience since I spend so much time typing.)
Anyway, before this post turns into a novel itself, I'll just list my current plan to end my keyboard adventure.
My plan initially was to end up with one ideal keyboard, but that was before I knew anything about the world of higher-end keyboards. The plan was then adjusted to having one keyboard that represents each of the major switch types. But that was again adjusted when I found out there are keyboards within the same switch type that I really enjoyed and wanted to keep, so now it looks like this:
Topre keyboards - I have a RealForce 87U 55g, an ergonomic weighted that's silenced, and a Leopold FC660C. I won't be getting any more. They each serve a different need (daily driver, typing when feeling fatigued, and in-bed typing on the Galaxy Note 3/traveling).
ALPS - The Matias Mini Quiet Pro is what I've chosen to represent this switch type. I don't need any others. I did order a Matias 60% with quiet switch because I think it will likely replace the Mini Quiet Pro, due to having all navigation cluster keys available. If I end up preferring it, I'll sell the Mini Quiet Pro.
Cherry MX - I have a blue Cherry (WASD V2 TKL with Retro keycap set), and I'm waiting for a RGB red cherry that is evenly lit with no light leakage (probably will be a Kailh RGB) that is sure to come eventually. The blue is for typing only, while the red is for gaming only. (I returned a Razer BlackWidow RGB and Corsair K65 RGB, due to the light leakage.)
Buckling spring - I'm waiting for Unicomp's new SSK that's coming later this year. (I had an Endurapro but returned it--the TrackPoint was disappointing, and full-size is too big.)
Programmable keyboard/Trackpoint - I want at least one fully programmable keyboard (ideally with Trackpoint), and I'm waiting for the next iteration of the TEX Yoda, which is coming around Q2 or Q3 (TEX Electronics told me this in private, so it's straight from the horse's mouth), and will have full programmability. Its implementation of the TrackPoint is really nice too, with the ability to use the middle mouse key as FN key, which is even more ideal than the MiniGuru's approach of using two FN keys on either side of the spacebar. I might still get the MiniGuru though, even if just to support lowpoly's epic endeavor.
All of that will come in under $2,000, which is nothing compared to what I've spent on pro audio/audiophile gear and photography gear. I think concluding my keyboard adventure on that note is a pretty nice ending. The whole adventure lasted less than two months, and I'll be returning my attention to my novel-writing--now armed with far better keyboards than the crap I was using. Mission accomplished.