My point was that the money goes somewhere. They move things around through sibling corporations, so that if you have a contract for a percentage of profits with one of them, then they move the profits to another sibling corp that you don't have a contract with. It doesn't have to specifically be the DVD production/sales that they are moved around through.
Forest Gump made so much of a loss the writer refused to do a sequel since he didn't want them to lose money
But that's nothing compared to universal selling the DVD rights to spiderman for $1 to universal so that Stan lee didn't get a cut.