I would like to learn the answer to that question too. Maybe they're too slow, and owners have gotten impatient? Wild guess - really have no idea. It could just be the bad economy and/or the cost of maintenance and repairs. I'm constantly surprised that well-built boats like Nordhavns have to be fiddled with and repaired every time they go anywhere. Can't boats be equipped with gear of sufficient quality and robustness that it doesn't break, clog up, jam up, fall out of adjustment, short-circuit, and work loose? I just don't get it.