No API is closed, so I guess there is no prove. So if somebody has or lets say had an account with 10BTC, I would pay 2% for that account so that would make 0.20 BTC.
Take it or leave it I guess.
cool, so I have an account with 1000 BTC there, I would give a discount, so for 1% (10 BTC) I'm willing to sell it
. I'm sure that any buyer will be able to check the accuracy of my info once Gox will open up (in the very near future
)