I will agree with you that the price is high.
I am so new to the whole EV conversion goal that i don't have a full understanding of what you just said.
all i can really work out is that because there are numbers that don't add up there may be some over optimistic claims made by the kelly company regarding these motors regarding their use up to and including 160km/h [even i think that figure is a dream from this motor]. I just want to have the car as a way of getting around and going shopping/work and still be able to use it as a semi family car on a weekend or for putting a MTB bike on the roof and going for a ride in the mountains. [refer to my post in the conversion forum, http://www.diyelectriccar.com/forums...ase-76422.html
the hard part is that i would like to try and convert a short wheelbase Rav4 to a EV and keep the AWD system. the idea of a hub motor seemed logical. and the idea of efficiency of the motors has yet to really enter my thinking process.
but if there are concerns with these motors it might be best to look at a more conventional EV conversion.