I was collecting SNES, NES, N64, Saturn and Playstation games back in the early to mid 2000s.
Back then there were some expensive games but it was a lot more reasonable. I really enjoyed to have all my games displayed and to be able to play those classics whenever I wanted. However after moving to a different country, I fell behind on collecting and the prices got pretty insane. As mentioned in a previous post I sold most of my old collection for 1500 (perfect complete boxed Link to the past, boxed Super Metroid, Dragon Force, perfect boxed Ocarina of Time and a bunch of other games, some loose, some with boxes and manuals etc).
I dont really care any more about having all my games displayed and building a large "collection". The high prices contributed to that a bit, but if people have money and that is what they enjoy then I say go for it. I like to look at collections on GAF and I always have a bit of envy but I realized it wasnt for me. I like to play games and there are plenty of ways to get those games to play (VC, emulation etc). Even if its not the exact same experience, I think those old games are great, and in some cases the experience can even be better
(example, I played FFVI emulated relaxing on my couch with wireless xbox controllers, cant beat that!).