Really, I think the entire issue here can be traced back to the way in which the OP went about looking for the info he wanted. OP starts new thread, asking for info on which 'retro' keyboards are most valuable, so that he can be on the lookout for some to buy cheaply, and flip them for a small profit to fund future keyboard purchases.
On the other hand, another member went to the Price Check thread and inquired about the value of a couple IBM keyboards, listed by part number. I responded to him in the thread, and he replied with the cost to him, and conversation ensued as to whether he could resell those keyboards to members here.
I then sent that member a PM, showing my possible interest in one of the part numbers he listed. He replied with a list of part numbers, cost to him, and amount available, and asked if I would help him determine what, if anything, would be worth him picking up and passing on at a good value to others here. I helped him with his inquiry, and we had a nice chat via PM. When I found out that the member currently owns no mechanical keyboard at all, I offered to send him one of mine, at no cost to him, and with no expectation of anything in return. I have lots of keyboards, and I simply wanted to help a new member get started.
Now, the member I helped basically wanted to do the same thing that OP wants to do, but he went about asking for the info in a much different way. I gave him the fair market values of the part numbers he asked me about, so that he can determine if it's worth it to him to sell those keyboards at a very slight profit. Is it worth it to him to purchase a keyboard for $10, and sell it for $20 plus shipping? I don't know, but the he has the info to make that decision. He didn't ask about which keyboards would bring the most resale value, but rather the value of the keyboards he has access to, in case he can pass on some good values to other members here.
There's probably a lesson to be learned in there, somewhere.
