Taters: Yes, you have to be careful when buying, because it is better to keep the product than sell. I don't see why you couldn't get the parts direct from Dynaudio or the dist. over there, but maybe not.
It depends on the person when selling, some care, some don't. Obviously, when you paid less you can sell for less on the used market. When selling electronics of a different voltage, if you're tech savvy, no problem. If not, then yes there is a problem. However, there are some (emphasis on some) independent techs who can do a good job of fixing things. Provided they can get the parts, which might be difficult, then you're ok. All of this must be researched before buying.
Playing in the high end is always a risk when it comes to service and parts. And a risk in general...The parts usually are quite expensive unless under warranty. Then you have equipment matching and what have you which I can't stress enough. *If* it's truly excellent equipment, it won't need much service if at all, and only new parts 20-30 years down the road by which time will be out of warranty for most high end products.
That's basically my take.