If you tell someone "Give me X and I'll give you Y" and you never intend to give them Y, then I presume you'd be guilty of fraud. After all X bitcoins does hav

If you tell someone "Give me X and I'll give you Y" and you never intend to give them Y, then I presume you'd be guilty of fraud. After all X bitcoins does have a monetary value, since people will trade you money for it.