> very difficult industry to turn a profit in 1. The coupons usually can be redeemed for up to 6 months in these sites and the money is paid to the company onl

> very difficult industry to turn a profit in 1. The coupons usually can be redeemed for up to 6 months in these sites and the money is paid to the company only when the coupon is redeemed, so let's assume a 3 month average float time. With clever investing you could do much in 3 months. 2. As with gift cards, I assume, quite a significant percentage of those coupons are never actually redeemed.