Working with computers every day, for 8 to 10 hours a day or more, for years on end has sucked the joy out of just about anything I used to enjoy that was computer-related.

Sometimes I'll get interested in something computer related on my own, like, say, emacs configuration, but nobody's going to pay me to work on that.

Basically, people pay you to work on something useful to them, and if what you're interested in is not useful to them, they don't care, and you can starve on the street for all they care.