Just want to add that if you have a Yahoo account with japanese bank account affixed and you speak Japanese enough to basically pretend to be japanese a good 30% of sellers will ship to you. 
there maybe already lies the main problem of about 99.2% of the users in here 
then they still have others to overcome.
I have an account. It takes living in Japan for longer than 3 months, enough to qualify for a gaijin registration card. Then you use that to get an online account at ebank.co.jp. If you leave Japan they allegedly shut your account down, but as long as you keep using it to pay people and send money into (I have it affixed to my Japanese Paypal account) I doubt they'd bother. I have mine (and am actively using it) 7 months after leaving Japan. Naturally I never told them I left Japan and am breaking their TOS but who gives a damn.
You can allegedly use Yahoo payments service with a foreign credit card but I've tried every single damn credit card I own (UK) plus every single credit card owned by my fiance (USA) and they basically reject everything. It used to be the case that most any card would work, but they changed that. They let you sign onto the site from oversea and they say they will accept foreign cards with some exceptions but the exceptions seem to be "all of them," including the card I sucessfully set up an account with 6 years ago which I am still using and THEY TAKE PAYMENTS OFF THAT CARD MONTHLY yet refuse it for new accounts. I wanted multiple accounts too for shipping to different countries but this limits me seriously. So I have to request "will you ship to the US" and "will you ship to the UK" on different items. My guise that I present to sellers of being a Japanese citizen "studying abroad" then looks shaky. Oh well. Hopefully most of them dont click on other things I've bought and view my questions to seller.
The other new rule Yahoo set up is if you don't reg your CC (which they never accept) or a JP bank account then they won;t let you bid on anything over 3000 yen. So you're screwed for bidding on most things anyway.
If anyone wants help sourcing items to be sent abroad I can help out for an obvious fee. I'd have your item sent straight to you from the seller, as opposed to using one of those insanely expensive holding services that bid for you by proxy. And like I say you have a 30% chance of the seller saying yes.
