MPEG-H shouldn't require expensive hardware/chips, but it would require a fair amount of processing to implement if its full video & '3D audio' as specified, hence more expensive than the 'normal' devices, but I wonder if there is a royalty payment to use it akin to HDMI.
Shouldn't be any royalties; my understanding is that MPEG-H is an open standard. Perhaps Sony's particular implementation of it involves money, though...