I've probably bought about 30-40 PS2 games, but own more Xbox games currently, though my PS2 collection is slowly catching up.
I'm still NOT into the next gen, probably won't be for a couple more years really, but when I do, I know I'll be looking for deals on CAG so I'll NEVER pay full price again.
Although, if FYE or another store would take my old hardware and most of my games(cept for maybe the GTA's and God Of Wars for PS2) and I got enough for a next gen system, I'd do it in a second.
I'm not all about having a 'collection', cept for the older stuff(PS1, Genesis, etc).