Interesting
I am in the fortunate position of being able to choose which projects to do. I've taken on big projects for companies in the past and vow never to do that again. I did exactly as you say, if the task wasn't to my liking, I'd ask for more money to make it bearable. Money doesn't relieve stress for me though, the task still has to be done if I agree to do it.
This project and the people I'm doing it for, I like a lot. I have my 'Minimum Viable Product' finished plus they gave me another week! Everyone's happy