All that They are saying about the flaw in the floor idea is just shit ... once people sell the coins in paybase they become the bagholder and They just have to  put those coins again on the markets with a price higher that the floor , let's say 21$ , if someone buys those coins they are not going going to sell it for 20$ at paybase since they are going to loose money . So no infinite game here .
They only have to worry about the coins dumped from hashstakers and controllers , and since they can control the stake and how many coins are created massives dumps to empty his resources and damage the coin can be stopped , specially if the controllers (wich are the ones with real power to create problems with dumping) are supossed to be in hand of people that believe in the coin and support it like Garza said . So again no infinite game here .