I'm sure hit-japan gets that same discount considering they have thousands of items listed at any given time. Point being, volume alone isn't going to give you an advantage over a company like hit-japan, not to mention the slow-ass delivery time.
There used to be a few JP games sellers on eBay that operated on the west coast. That was a big plus in my book. I got the games quickly, from people fluent in English (which is obviously a bonus when dealing with you as well), and with dirt cheap shipping.
I'm just saying THAT is what would bring my bucks to a JP-focused retro seller
