Maybe I didn't understand but if you are saying that you are not taking responsibility to loss of MSC and the amount of time is the same why is a percentage fee justified on large trades?
I thought he said that he was taking responsibility for the MSC entrusted to him. Anyway I think that a percentage fee is fine as this is how normal bitcoin exchanges work, why should the fee for this be any less? It's actually a lot more work than an automated exchange..
For the transaction I just funded, the fee would be over $400. I think this is excessive. You guys are awesome and I am glad for your help - but I'd like fees to be in the spirit of bitcoin rather than Visa.
The amount of the fee is relevant to the trade. If you want him to escrow a $40000 trade for you then $400 isn't really that much, especially if he is responsible for this $40000, what if he sends the $40000 to the wrong address and it is lost, will you expect him to cover it? The larger the trade the more risk he is taking by accepting the escrow request.