Personally, it's not that I don't enjoy gaming, but I feel guilty for the time I "wasted" afterwards. Every other activity such as cleaning up, going out for a walk or even reading a good book seems to be more rewarding and useful than playing a game.

I tend to give that as the reason I started teaching myself programming, and later I won't allow my children to waste days playing games. But let them do more productive activities on the pc such as video-editing, messing with photoshop, chatting with foreigners (the good old days on IRC..)