I can't believe anyone here is using a third party Escrow service to sell a domain - never in 20 years has an end user explicitly asked me to use Escrow or refused to buy a domain unless I use Escrow and that's up to 25k.
If your customer asks for Escrow there must be something suspicious about your setup, that's all that I can imagine, you might be be legit, but there is something somewhere that rings alarms bells, of course if your using SEDO then you will be forced into Escrow.