When you really stop to think about it, it's a strange practice (the whole producer credit for more money thing) because, at the end of the day, the production only has so much money in its overall budget to pay for everyone and everything. All the producer credit does is instead of pulling money from one pot of money in the overall budget, it's pulling money from another pot in the overall budget. I really don't get how that works unless producers aren't being paid from the shosw's/movie's budget but are paid by the producing studio directy.