I believe so. Whatever is owed, I think the legal tender concept would apply to it. So the difference I see is before the transaction vs after the transaction. For example, if an online website refuses to offer a certain service for cash, I'm not sure we can do anything against that. But once the service *has been* rendered and they come for payment, no matter what the agreement was ("card only", etc), I don't think they'd be able to refuse cash. They might refuse further transactions though; I think.

I love what that Gentleman did. But I'm personally more a fan of building a network of (local and online) people to deal with, outside of the Grid/Matrix.

Like Texas Slim was saying : shake a rancher's hand :-)