The market based answer is that they are not considered to be competitive. This is further complicated by their inability to figure out how to make spare parts and service profitable enough for them without resorting to the extortion of the owners of their older gliders with the service contract/operating manual scheme.

In regards to their newer gilders; they have already demonstrated their lack of intelligence when it comes to attempting to force people to buy things vs. making them want to by things. What will keep them from changing which gliders require a service contract in the future? "Trust us, we wouldn't do that" sounds a little hollow coming from an extortionist.

Look at the resale values of older LS and DG gliders before and after the Service contract fiasco. DG has cost a lot of us, a lot of money, and we are not likely to forget it. I really don't see how a company that acts like this expects to survive, and I really don't think they deserve too either.