You don't take into account us who have already paid these people money to make Avalon chip based miners and now are forced to take a 30% loss in converting our old orders to these new boards.
You weren't forced to take a loss. You could just supply chips to burnin as you agreed and he will assemble them into boards for you exactly as agreed.
He is generously offering to refund you a proportion of the money that you spent on a non-refundable deal - and you are bitching that he is somehow in the wrong?
roy