Probably lies in costly trademark and patent right. This will make the initial investment high and the risk would be high too as China is notorious with 'copycat' and there is no concrete laws / regulations to curb it. General Motors, Rolls Royce, and other big firms learned it the hard way.

So, if a firm is to invest in such product, they need to price it at a 'premium' (ROI mah). Then, you need to factor in the risk of the highly efficient copycats out there and marketability of these products as not many ppl would fork out rather higher amount for a 'generic' product. That could be the reason of no taker.