Can you provide a signed message from addresses associated with the accounts in order to prove ownership?
Also I think your prices are somewhat high.
I will not disclose the accounts before the sale is final, because I don't want them to receive a negative trust because of the account sale. I have sold many accounts in the past and using escrow is risk free for both parties, so it should not be neccessary.
can you provide signed messages to escrow after escrow is funded? Using escrow does not prevent claims that the accounts were hacked after the sale is complete.