its the process that is a headache. check this out, i worked as an editor for a long while. did shows on commission, all that jazz. but it was never serious. one day a rich dude contacts me, starts taking about working in television, has all these ideas for a book, wants to do a movie so i go okay, yeah, i'll do it. what's the harm? get paid. sure. but what it did was create a space where i started to hate something i loved. his ideas were just garbage, and edits weren't going to help it. i ended up asking to take my name off the piece because i dredded working on his piece so much. it detracted working on stuff i was a lot more passionate about because the person basically owned me. i'd get calls at random hours and be waiting for callbacks all the time. its shit. its the opposite of professional.
now, i cant speak for any of them and neither can you but in my experience it was goddamn awful. i spoke to a few different people that had similar experiences.

fyi, there are plenty of websites dedicated to these kinds of commissions if you're interested, but its passionless and hell. mark my words.