Innocentive has a number of users who don't exist, they use those fake users and make them win contests using designs sent by other users, they don't want even to give you a little cut of the reward, so they create those fake users to get the whole reward for themselves, but fraud always contains flaws that make them get uncovered, sometimes a contest contains 4 points and you find 7 winners, each from a different team and each takes a different sum of money, I am one of thousands of people who wasted their time and effort for the good of those thieves.