They comp my meals!
Seriously though, I have seen the pit boss buy drinks for a big bettor. The boss told the waiter to charge it to the casino and he did. No one else at the table got free ones though.
Another time a friend of mine was playing the table maximum for several hours and he bugged the boss for a long time and they said they would send a bottle of wine to their dinner table that night and they did.
One good thing is that I drink less when I have to pay for them.