There are always problems with any voluntary poll. People might not want to disclose earnings, others may want to pretend they make more, and with the recent SS change there could be people with no SS account who will try to drive down the poll as revenge. But still, it's useful in general.
I'm answering because, everything depends on what the poll can do and how much time Leaf wants to spend on it. I like your idea for a Video and Photo divide. You could have said the same for Photo vs Illustrations/Vectors for many years.
How would someone vote? Agency then Video sales and in another vote, same agency and photo only sales, might as well ask for illustration sales as long as everything is being segmented.
Anyway, with the changes, video vs photo is a good question.