Originally Posted by S.Bling

In order to entice true whales into a particular casino, the floor manager and/or gaming director may offer a discount rate on losses.

In other words, they can be offered a 10% discount which means that when they lose $100,000 in a hand, they only owe the casino $90,000.
Knowing that in Casino X they get a 10% "discount" might make them more likely to gamble there rather than somewhere else.

And so on and so forth.