I say we cut our losses and move on. There hasn't been a postcard from the last round in several weeks, I am not expecting anymore. I predicted a 10%-20% deadbeat rate and have resigned myself to that fact in all the exchanges. It's just part of human nature in general.
Let's get the next round going and cull the ones that haven't sent out postcards from the last rounds. Catering to the "slow and weak", who are in the minority, is bad for all. Just a suggestion.