These guys keep telling you you're giving them the wrong clubs, the wrong yardage. Sometimes a caddie might be wrong, but very rarely. They might give you a bit of stick, but you have to be able to take it. For all their efforts, though, caddies do get something in return. There is no set amount that they get paid since all of them work as individual contractors, negotiating their salary before they're hired.
Reputation plays a part in how much a caddie can earn.
But the money isn't the important thing. It's not only a great feeling for him but a great feeling for you. You live for the win. Follow signs to I-10 westbound. Exit Cortaro Road.