[mattmcknight]

It just seems to fail a very simple test of allowing the government to steal money from any one that offers any thing that has an expiry. To take it out of the virtual world- can the government escheat from a restaurant the remaining value of food at a buffet restaurant where you are allowed five trips to the buffet but only use two? The expired items have no value, so there is nothing to escheat.

It's true that they could declare a law against expiry, but that would seem to be a completely separate case.