I think what suchmoon was trying to explain to you was that you could not have sold your paycoins for $20 on the exchanges, even if you had tried to - because nobody would have been stupid enough to buy them from you for $20. Not even Garza was that stupid. He just said that he bought XPY for $20 until he ran out of money, but that was a lie, too. He never intended to create a "floor", he just wanted to get your bitcoins and euros.