If they are selling QBK for btc then it is exactly a ponzi. Without proof of anything in the last month, ponzi suspicions are justified. How long will the dividends keep pouring??
And FYI we know that QBK is trading for btc because they have "stabilize fund".
If that is their sole means of profits, sure, it would be fishy. But it isn't. A lot of the stabilization fund stuff stabilized the price (not surprisingly), as they bought up coins during the low period of the coin. Since they pay out some folks with QBK, it'd could cost them more in the long run if they just sold QBK on the market, then had to buy it back to give away as dividends.
Plenty of coins have stabilization funds, but it doesn't make them all ponzis either.
A better criticism is asking for more info in regard to liquid assets, or assets not tied to trading (such as mining) and the exact income generated each month via those means. That way you'd have a rough estimate of money earned each month, semi-guaranteed, at least for the near future.