1 - Leased line prices. Pricing it below the competion in order to kill off the little fishies. 3 - Inability to supply a rotary larger than 20 PRIs. 1b- Cost of domestic bandwidth. 2 - Venture Capital.
Lets face it, there is next to none in Japan.
Without something like a big ass parent company, the average ISP here will grow slowly, too slowly to survive. 3 - Global Clue Shortage. TO FIND in Japan. I can't find good Japanese engineers. Half-baked dweebs that need to be micromanaged are not something I want or need, but its all that's in stock.