I know I have. I had a wonderful collection of C= 64/128 stuff with modified 1750 and 1764's, several 1541, 1571, and even a few 1581's.
Later I moved to Amiga's. I had a nice A1000 with a Spirit Technologies external RLL HD controller and an external X-Ram card. I sold most of that stuff.
I have actually collected back most of the computer related things I regreted selling with the exeption of the early C= stuff. I probably wouldn't ever use a 64 again anyway :-) Since I really hate that feeling, I am pretty careful about what I buy anymore. Chances are if I find it and I really want it, I'm probably not going to sell it unless I get really desperate.
I recently sold my house because it was just to hard to afford it by myself. I still have all of my Amiga's though :-D
Jeff