I get stuff when it's cheap on steam, so it'll be in my account for when i have a computer that will actually run it well, or if i'm like staying at someone else's for a week and want to have some games to download and play, etc.

It's not the most sound reasoning ever, but at least I can semi justify it. I don't mind not playing them now, they'll be there when I can run it well. I've never been big into cutting edge of PC hardware anyway, I always just wait a few years then play the stuff I missed.