I should correct myself, however. Yes, I made the assumption that the 501st didn’t get paid for the work they did without evidence, which may or not be the case. I don’t really know. They’re cosplayers and, like reenactors, they do this stuff for fun - charities, demonstrations, contests and parades and such. Rarely for money. I could be wrong, however, and yes it is possible that Lucasfilm compensated them. An equal assumption of guaranteed payment, however, is just as speculative as my assumption of non-payment, and can only be truly settled by someone in the 501st wandering in this thread and saying “yes” or “no”.