(d) they charge you your max bid.  it doesn't 
matter if the next runner up is 5,000 yen, they 
will charge you 20,000 yen if your max bid is 
20,000 yen.

I was wondering if there's a scenerio that no one 
except you bid on it with a min. and max. bid 
amount, will they simply charge you your max. 
bid? I seriously hope not.

I do know that if both A and B place the same 
min. bid, then the one who has the highest max. 
bid amount wins.