Account that i got doesn't need no additional deposits in order for it to be "working". So 10k or ~1.5k is much cheaper.
I can do escrow.
As for other exchanges yep you are right if they accept new members without any restrictions.
Logically thinking if you deposit that 10K money still it will be yours but if they pay you then straight away they lose 1.5k. I never use Bitfinex so don't know much about their deposit requirements.
Last month there was a lot of rush to crypto exchanges but now it looks already cool down so anyone can get an account easily. Good luck to you for selling your accounts....