I have a backlog of 20+ games. Why did I just buy another 20ish? Sale. Incredible freaking sale. I may forget the games in my backlog and run with these, or I may wait two years to play them. Either way, they're all games I've been wanting to play for ages, and I got them dirt freakin' cheap even compared to current retail prices. Can't argue with that one. But I'm done buying games for now. TIME TO FREAKIN' PLAY THEM!
I'm with TC. I was going to buy Hitman: Absolution the other day because it was on Amazon's lightning deals for a ridiculously cheap £14 (games here are £40) brand new, but I thought "Why?", I already have so many games in my collection unfinished. If I eventually clear them I can then pick it up, and for probably cheaper again.