Discount sites like Groupon are sure to fail because their model preys on desperate businesses. They may be profitable, but it simply isn't sustainable. They persuade desperate businesses to offer steep discounts, and then take half the face value of any coupons sold. The business is left with a loss, and Groupon profits by doing nothing more than taking advantage of one's desperation. These leeches can't fail soon enough for me. read full review »