Yeah, I think my problem was that I wanted to replace a lot of the games I had sold before. I owned a Turbo back in the day, but my main loyalty at the time was to my snes, genesis, and sega cd. I later bought a Turbo Duo in the early 2000's, but i sold it off a couple years later when I started hardcore Neo Geo collecting. Last year, I found the system I had sold (the exact same one), and I'd always regreted selling it, so I repurchased it.
Unfortunatley, it didn't take long until the sound issues arose, taking the fun out of playing cd titles. I eventually had it fixed, and once I had a working Duo again, I just sort of went bat-shit-crazy buying and playing games on it.
I really don't have any regrets at all about it, it's just that I never really bothered to add up what I had spent until reading this thread. The cost of those games added up quickly!