That would be the Japanese version which has the credits to correspond to their own currency, the yen. Their limit is, I believe, about 200,000,000. It all equals the same amount we are paying, but basically with more numbers added to everything.
Oh I didn't really check the GT website in a while. I didn't know.
Also in the Japanese version of GT4 I saw a screenshot of the Mugen S2000 and it cost a few million credits. So the same would apply with different region GT games?
I'm guessing it was a different region because it didn't cost as much on my U.S version of GT4.
Also he/she probably used a capture card to get an in-game screenshot.