There's many flaws with that scenario: 1. A centralized trust/identity system (as I have said is need with this) means that there could be no such thing as Poo

There's many flaws with that scenario: 1. A centralized trust/identity system (as I have said is need with this) means that there could be no such thing as PoorCoin as defined here. The idea is that because it was an XCoin, created on this network and tied to an identity endorsed as a single user by Centralized Thing X (this could be registered to SSN for example, though of course that has problems right now. You get the idea.), anyone will accept any trusted coin. 2. You're applying concepts like pegged currencies that don't really seem to apply. This isn't really a currency market - to everyone, it's just Coin. It doesn't matter what name is on it, they all have the same value. A low/high availability of XCoin doesn't drive the price anywhere because it's equivalent to literally any YCoin. There is no market to corner because no one cares. To put it in economic terms, buying up a market and hoarding doesn't matter if there are literally billions of equal value substitutes. 3. It will be impossible to run out of accepted 1 to 1 trades for PoorCoin, even if it were ever to exist. 4. Anyone on PoorCoin, if it were ever to exist, can then still make trades.