That certainly sounds interesting.I have. I used getcars.jp as my agent and found them to be very helpful and they charged what seemed to be a low fee. I still have access to their online system which means I can search all the auction listings in the country and also see all the statistics on past prices for whatever make/model/mileage.
I'd better stay away from that auction site, or sooner or later, I'm going to find reasons as to why I need a new car.