I like mine okay - I used to be in big industrial sales, selling to steel companies around the Southeast, but now I work in a gym (my friend is the owner and I came on board to take some of the personnel burden off of he and his wife). It's a good job, and I love helping and training people, as well as the business side of it, but there's a downside:
I get to the gym at about 9:30 or 10:00 most days, and lift from then until I start work at 11:00. Off at 7pm, at which time I try to run a couple of miles most days to keep off some of this post-30 flab, then shower, and go home. It seems at times in my mind that I was "at work" for around ten hours a day, when I actually worked only eight.
Sometimes when your hobby becomes your work, it seems to carry with it a little unexpected burnout.