[QUOTE=sim600;5830655]I think the Cup Racer has been selling like hot cakes because of the
1. adjustable wheelbase
2. neat variable battery holder gimmick
3. those datsun shells!
4. Hara going round beating people with his Cup Racer
but ya, mostly, it was because of the Datsun shells.
QUOTE]


My guess would be availability, because HPI has a readily established dealernetwork all around the world.
All the other manufacturers of mini 4wd's don't!