[tedsanders]

The supply of first edition Charizards (a pokemon card) is also fixed. Any future printings will be a later edition. By your logic, is there a reason we shouldn't use first edition Charizards as currency, since the supply is fixed? (Counterfeiting is the only good argument I see.)

[GigabyteCoin]

Counterfeiting is a good argument, and also instantaneous transfer anywhere in the world at any time without any extra security necessary.