Dirtracer: Its all about bussiness. Nanda is making the car for Radical, The Radical name is well known in the USA, Nanda is not. There are several other reasons as well. we have several manufacturers that make products for us. As Black stated its like OFNA and Hong Nor. OFNA doesn't want to spend thier money to advertise another company, they would rather market thier own name. that was if something happens and they decide to have XYZ R/C make thier cars it not money wasted.
Caster is not Caster everywhere, The Caster is also called HobbyTech, Speedline, and a few other name throughout the world.