I am extremely thankful that expertise in my hobbies are valuable; and there are a couple times where I really f'd up, and consequences could have been much worse than they were.
As a musician by training who was forced to take "any job" out of school due to lack of gainful applications for music skills who is now trying to reinvent himself as a professional programmer (a loved hobby), I feel that. I'm thankful for life, the universe, and everything.