Except those of us that RENT games... I only have about 8 games in my collection total, and I've never had more then that at one time.
It lets me burn through the short games that arn't really worth the $60 without feeling bad about it.
I enjoy going thought and trying to 100% games, just exploring every nook and crany until I've seen everything there is to see. At least achievements give me a decent guide to how far along I've gotten. Like all the past Tony Hawk games I went though and completed every challenge and got every gap in the game. At least now I have an achievement I can point to when I say that for proof.
but I suppose that, as well as any other form of gloating, could be considered a "wank" factor.... so long as you're refering to "wank" as some sort of e-dick size.