Can't be all you guys ever sold was keyboards and keyboards related stuff... unless, these were the ones you regret selling... For myself, I regret selling off my only mechanical watch, back one time when I really needed cash for an emergency .. and now all I'm wearing is some cheapo Pebble. I can't afford a mech watch!
Hmm. I used to have a diecast 1:18 scale model car collection that I sold almost all of to support one thing or another. Part of it was to buy some Mortal Kombat prototype figures, like the only set of its kind ever produced, and that cost me $1500 back in 2008.
I kind of regret selling my unopened Nintendo Club Super NES Wii Classic Controller, but I have another opened one.
That's about it for now!
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I still don't regret buying these.
You bought that?! I remember that set! I was getting into figures/toys around 2008 and the first things I bought were MMPR Megazords and the NECA TMNTs. I had a boxed set from NYCC of the NECA TMNT figures with all of the accessories--signed by Eastman and Laird.
I sold it last year. Until then, I vowed it would be my grail piece until I died. It hurt when I ended up selling it, but, oddly, it doesn't even phase me anymore.
I still have all of my Megazords, though.
Pic related is also something I regret selling. I sold it around the time I was getting into keyboards, and I never touched it since I already read all the comics. But the first volume was really limited and I was able to get some good money out of it so I thought to myself, "I'll put it toward keyboard stuffs I'll actually use." That was a dumb move.
I had all the super hard-to-find hardcovers of Usagi Yojimbo, and now they're all gone. 
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Haha, yep! Well, what happened was, I saw the owner list a Goro statue, and for some reason, I just felt the urge to ask if he had the Reptile figure from the unreleased 2nd series of Infinite Concepts figures. Turns out the guy was actually the creator of the figure line, so he had the actual prototypes that were put on display at several conventions at the turn of the century, haha. So long ago now, but I loved how the figures had that MK II + original comic art style look by John Tobias to them.
I was shocked when they were listed for $1500, because I hadn't paid so much for a single thing in my life at that point, haha. I was selling my stuff like crazy to get the cash for it. He told me he wouldn't sell to anyone else, he just wanted to gauge interest of the prototypes before selling them to me. I feel lucky. He also had some random Series 1 prototypes and a "Series 3" that was just figures from the first series that were "Kombat Damaged," but the damage was pretty minor and not all that interesting. I would've bought them all but I couldn't afford it. I think the Series 2 figures were the most expensive though. Definitely the most iconic.
I also bought the first Goro statue of the shipping lot (the shipping box is marked 1/200 or something, ha), and a sealed set of the Series 1 production figures. Those Series 1 figures are price crazy high these days. It cost me $100 for them back then.
Er... Anyway!
Yeah, I find that selling something and replacing it with something of equal sentimental value or importance usually lightens the blow, or if you've moved on from being attached, haha. A lot of the rare Alps keyboards I don't want to sell... the reason I'd rather not sell them is because of how long it took me to find them and for a lot of them, the good prices I got them for. I know I could never get a Xerox DocuTech for like $25 a piece now.
Ouch, selling those hardcovers sounds rough. Hopefully you bought something that's as near and dear as those were to you. That's exactly how I feel when it comes to my reasoning for not wanting to sell some things, even if the prices are high for them. It would just be so hard to replace them if I ever wanted them back. If I sold the prototypes, obviously, I'd never get them back. Haha.
