I don't think it has to due any thing with the car brand, Kyosho both On Road & Off Road has top Kits, yes they might be little more money. Remember the bottom line is money these company are in it for, not all these driver are moving just because it might be better car, there is money behind it some how in some form or another. I have seen at our local level people switch cars not because one is better they just follow others. That just the way it works, how many people made the jump when those Kyosho driver were running the M3? I bet a few, now that they are with another team they will follow