Standish, Michigan It's two p.m. on a workday, and the casino parking lot is completely full. Hundreds of people have come for the $20 gambling coupons offered to those willing to donate blood. Turnout for the drive was "above and beyond" expectations, says Frank Cloutier, a spokesman for the Saginaw Chippewa Indians, who run the 800-slot complex. The nurses are already turning people away two hours before closing, and they will soon run out of blood bags. "We get free money!" one woman tells me, clutching her coupon as her friends nod in agreement.