Because life is short and you should do what you're passionate about!
Six days ago, I had brain surgery. I made it home a few days ago and I'm still mostly bed ridden. Despite this, I'm starting to work again because I love my job and I'll be bored out of my mind if I stop...
If I was at differently stage in my career, I would probably be playing Civ and shooting for a religious victory under Canada (the religion would be named "Tim Horton's" of course).