Since porn appears to be an "in-the-now" type of business, I think any PW who reduces her scene rate for a piece of the back end is asking for trouble. In an industry where bouncing talent checks is a business strategy, do you think a PW who lowers her anal rate to $500 upfront with profit sharing will get a lot more through residuals on that scene? The only "back end" I see her getting was the cock that violated her anus.