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?
Even where he doesn't provide a guarantee - he must take greater care in handling large BTC. Large transactions deserve a larger fee. Just not over $100. That is a lot. I'll be signing up for escrow job if I get $100 to make one MSC transfer.