This is why remembering to have fun along the way is important.

I know that argument. But I can't get hold of it. What can I do, play a game? I'll have to examine everything in terms of expected utility. If I want to play a game I'll have to remind myself that I really want to solve friendly AI and therefore have to regard "playing a game" as an instrumental goal rather than a terminal goal. And in this sense, can I justify to play a game? You don't die if you are unhappy, I could just work overtime as street builder to earn even more money to donate it to the SIAI. There is no excuse to play a game because being unhappy for a few decades can not outweigh the expected utility of a positive Singularity and it doesn't reduce your efficiency as much as playing games and going to movies. There is simply no excuse to have fun. And that will be the same after the Singularity too.