The $750 price tag means that either someone is getting ridiculously rich and/or the prices are artificially inflated in order to discourage repair. There's no reason a board with a few relays or MOSFETs and the processing power of a pocket calculator should cost much more than a Raspberry Pi.
It's exactly this - once the line stops making the boards, they stockpile the remainder for warranty support and as that supply dwindles the price begins to skyrocket.
