Quietlion,
I stayed at Ballys 5 times and got their $25 airline coupon(its really 5-$5 coupons).As for using it the ONLY prob is you must use their agent and the tkt must not be a web only tkt.
You can combine coupons with the following limits,1)fare$200 or less can get $50 off.Over $200 up to $100 off.
I booked a CO flight for $250 to LAS was there last week and the $75 check came today in the mail. (got #4 & 5 coupons last week) Keep in mind its $25 per stay if you check in and out you get another) I stayed 2 nights with the night in bet at a different hilton prop to get hotel credit also.

as I said it cant be a web-fare only so all the cheap flights to LA were web so I flew to LAS and drove to LA(all of 4 hrs) for the weekend were I had to be. final price of tkt ws $175.