This is where the burger analogy breaks down in my opinion because it's a lot harder to deliver a fraudulent burger than a digital signature.

What can happen in real life is Person A and Person C are given a digital receipt confirming delivery of the burgers they were owed and that is the end of the transaction. To shield themselves from revealing potential fraud, the brokerage will charge a $500 fee if either of them ask for proof of their burger.

Now, while there may only be one burger in existence, it appears as though there are two, keeping demand artificially flat.