Class D is still growing and coming out from it's infancy.
The technology isn't here YET to get the switching frequency for Class D far higher than what's available at present.
Once this technology is developed only then Class D may get to be considered real high end.
Doesn't matter how much is spent today like the above $38k Rowland, hifi manufacturers can't make the switching frequency technology happen, this can only come from big component manufacturers, like Burr Brown, Analog Devices and such.
Once this Technology is developed, and it's coming, all linear amps tube or solid state, will become worth less boat anchors, and Class D will become the norm for hiend instead of being just a good bass amp.
Cheers George