Definitely time.
I keep a list of games I want to play and generally do not buy them until they hit the $10 - $20 mark. As soon as they get that cheep I buy them and they go on the shelf. But unfortunately the backlog keeps growing, because gaming is only one of the things I enjoy doing outside of work. So I most likely only game one evening a week, unless I get really hooked in a game then I will try to make more time.
As for replayability, this use to be important to me when I was a student, but not so much anymore. I would prefer to go through a game once and move on to the next. I hardly ever touch multiplayer, unless it is a way to play the main campaign in co-op.








