I have been paid as much as $250 for that, and cried about the lost whales.
It all depends on the integrity and intentions of the affiliate, and so these deals are often made on an individual basis.
Programs tend to trust affiliates more if they have been around a while and are prominent – and that has proven to be a huge mistake for some.
We are not talking about someone cheating a program out of $100 by sending in their girlfriend and sister to make a deposit, we are talking about someone doing this on a huge scale with several programs and over some time.