I don't understand why the similar priced DongFang D250-RTC-B has so much lower specs, more plastic, less steel, and why dealers would still go with it, and not the Yingang.
As far as parts, I don't understand why a dealer can not buy a lot of these bikes; from 30, there's bound to be one that's bad, and gets returned. If so, the bad one could be used and sold for parts. Selling the bike in parts should give more profit, than selling it as a unit.