You're right, there is a limited number of OEMs but much like the screen analogy used earlier, the difference lies in what goes around the basic guts of the motor. Be that the quality of the bearings/magnets/copper or the firmware in the ESC there will be a difference based on the market cost of the items. Do I think that Warhead motors are overpriced? A bit. But they were the first to market with a well made product and responsiveness to customer feedback. They went down well with the early adopter crowd and what we are seeing here is the upshot of the market reacting to that. The OEMs knocking out cheaper versions of the same basic components just with varying levels of sophistication added on by the "brand".