There is usually a reason for a change in policy like this. The most logical one being that too many pieces are breaking. I bought a used KAV-500 which required fixing twice. They did fix it under warranty and they also paid to replace the drivers in one of my speakers the amp took out. They took a while to do it, but they did do it. Maybe they are just tired of being good guys, but I doubt that is the reason. I did like the sound of the amp though.
Beware of new Krell Waranty Policy
I have ownwed and then sold krell products for years, I was thinking of buying the new hts processor, but I just found out that krell would no longer honor waranty's on their products sold by individual owners, only used products sold by their dealers, this makes buying a krell a bad investment, with the new waranty policy, they will be very hard to sell in the future on the used market, so unless you want to keep it forever, I would advise not to buy one, I am not a krell basher, I have been very happy with their products, a word to the wise !