Use the comp to stay at casino A. Don't play at casino A (maybe some bonus accumulation slots, poker, or light bj).

Play at casino B, C, and D rated using a chill spread to garner future comps.

Revisit casino B, C, D etc. and play for real unrated.

Trip 2, you should have plenty of rooms/food/freeplay offers from B, C, D. Don't play hard at the place you're staying, only the other places.

You get mailers for quite a while, even if you stay and stiff the place.

One large chain was sending me $400-$800 a month plus rooms whenever for almost a year based on one losing session! I gave them almost no play for that long.