I'm big on the cult of the old. I'd rather play one game ten times than ten games one time, and I think that if a game can't hold up to at least five plays it isn't worth owning. Of course, if other people want to spend their money on that kind of stuff, it's fine, but I like to keep my collection small and replayable. In my opinion, the best board games get better with repeated plays because that's when you can really get into the strategy.
Side note, but I also really hate the idea of legacy games where you just have to throw the thing out once you're done.