I think it happens to everyone, actually. Earlier this year I decided to buy a PS3 (finally), but mainly for the Bluray player and the ability to watch Netflix without paying for Xbox Live on my 360. Since it had been a long time since the PS3 came out, and quite some time since my PS2 died on me (which was before I got my first 360), I was drawn away from my 360 for a while. I have close to 30 games for the 360, some of which I've played several times, but I suppose I was bored of the system as a whole after ~3 years of only playing it. Now it's about four months since I bought my PS3 and I'm back to playing my 360, so it didn't last all that long, I suppose. I like variety, though, and having two consoles lets me buy the less expensive third-party games for one or the other.