TBF, 5 hands at 1/2 PLO isn't terrible. You guys are the worst to deal to.
Generally it takes several players (and management knows if you're gaming the system with your buddies) before more than a quick word is said IME.
Stiff the bad ones is probably your best option.
I've never heard of a merit raise. You ever hear the joke: what do you call the doctor who graduated last in her class? Doctor.