I suppose once an innovative cost effective product or technology catches on in the high end audio world, it is ripe for a big markup if its performance is competitive with much more expensive gear. Class D amps fit this bill perfectly. I doubt that the much larger potential markets other than "high end audio" will go unserved though, so I think there will be many competitive offerings with excellent performance at a range of price points. Some will be more luxury minded and others more value oriented.
