Except it isn’t. On average you can make a couple bucks extra on each person.
But if they don’t try to double dip, that’s a couple bucks left on the table, and that’s worse than death, apparently.
Nevermind that by trying to double dip they lose money in the short run, but if they can push the standard practice towards it even half a step, that’s fine.
It’s one of the few things corporations seem to be able to see the long view on.