Starting to get the idea, so the exact amount of Dash is decided at the point of sale, does this mean the sale of the Dash to fiat is made immediately and is there any allowance made for market fluctuations after?
Is it a case of getting roughly $20 for the t-shirt, what would happen if 100 people all bought 1 at once for example and there were not enough  (convert to fiat) buyers on the other end at cryptsy when the market is quiet ?