... I want kids, someday. So that will be even truer then.
Currently I do agree with saint, building the arcade cab and figuring out the emulators was a lot of fun. I spend much more time doing that than playing. I'll play one game, and think, okay what game am I missing now. Okay I have the games, now I need a way to store them. Okay I have a way to store them, now how can I make my office/game room look cleaner.
I have this problem as well. I think the main problem I have with aracde games in particular is the games that I particularly like have zero replay value and there aren't very many of them.
My absolute favorite genre is the beat-em-up... you know final fight, tmnt, ect... The problem is there are only like 20 of them and each one can be beaten in like an hour or two. After you've beaten them you don't want to play them for a loooong time.
My second favorite genre is the street fighters but those have even less replay value... at least in single player mode.
I also like horizontal/vertical shooters, but again, not much replay value and they are quite short.
And then the classics, while fun, aren't fun to play for more than 5 minutes. I don't particularly want a perfect score in pacman, because their really isn't any reward from it.
So mostly I play console games anymore. Ubisoft gives me at least one good, long game a year (AC and/or POP) and there are usually some fill-ins like the upcoming Arkham City and such. I'm pretty much down to 5-10 games a year anymore, which is kinda sad.
As to the original question... Why would you buy a game you have no intention of playing? I just don't get that. Buy it once you have the time to play it.