I'm a little surprised that most people think that they really pay unique users (is there any proof of payments at all?), but it seems to me that they have created an account farm that they use as a cover-up for their campaign.
They are too smart to know those who deposit to test the system to see if it pays or not and those set of users usually stake with a little amount, in cases like this they sometimes payout those smaller amounts to give you self motivation to come back with a high stake and to have some kind of society backup. But their major targets are high stakers. They act like a Ponzi scheme( pay 100 people, scammed 10,000 people )