As for escrow we feel that that having it for the remaining full price is only fair. The deposit allows us to make sure the order is valid and legitimate.
Escrow with a reputable forum member would give you the same warranties and give us some. Refusing to do so is a
big scam alert.
Currently your offer is indistinguishable from a scam attempt with a cheap website (probably far less than $500 including the time spent setting things up) to make 50BTC ~ $5000.
There are lots of scammers around able to pull this and not many professionals able to make the product you advertise...