Not true, 95% of Japanese kits cost the same if not cheaper than Revell/Round2 kits, remember, there is the import mark up fee, and it goes both ways, you should see what Revell and Round 2 kits sell for in Japan.
Buying direct from Japan lets you get the kits for the price in that market, which brings the cost of the kits down to around the same price as US kits here.