Tamiya does seem to rule the roost.
If you look at their national series & regional qual races it promots a fun series.
HPI also had a series but then dropped it,sold those cars.
My son and I both race Tamiyas cause our local track, Burien Toyota in Washington sate puts on biweakly outdoor races under their service entrance cover,rain Mostly and occ.sunshine.Pus we have two top drivers,Dan Garber @ Brett Sicily, that help everyone, not only with setups but driving to.
The other local tracks seem to have the car of the week club.
If the US manu. would set up something similar Im sure their poularity would also increase. And I do own American REAL cars!