If there are clams (some extra gas money), then that's fine; if there's spurred emotion (someone says, "Hey, I liked your novel."), all the better.
It continues to be my pleasure to live, research, study, learn, laugh, spend time with my wife and daughter, etc., and I have yet to see the downside.
"Writing is its own reward." - Henry Miller.
"A person is a fool to become a writer. His only compensation is absolute freedom."
- Roald Dahl