The reason why is because gambling in Oklahoma is illegal but bingo isn't so the casino basis everything off of bingo odds. The slots odds of winning are all based on bingo card games odds because of the Oklahoma state laws requires this to be the basis of a winner. This is hard to explain but I will try to do the best that I can. You can't even when small jackpots to keep you interested in playing, like slot machines at casinos in other states. If you play the slots then kiss your money good bye! Anyone that tells you any different doesn't live in the area like I do or they work for the casino.
You could win back then but now that it expanded to this huge empire you can forget it. Back then it looked like any other bingo hall that had been around since the 1970's. I was going back when it was a dinky little building with about 40 slot machines and a bingo hall. I have been going to Winstar for over 15 years to play and purchase cigarettes from the Indian reservation.