If domestic breeders are making more money selling directly to hobbiests, then I can't see that there would be the same relationship as in Japan. If the level of quality improves to the point that more dealers buy from domestic breeders, then perhaps things would change.
In Japan though, the breeders do sometimes sell directly to Hobbiests. Kato-San does support the breeder dealer - relationship and uses deelers to buy Koi from breeders.