The thing I see over and over from traders on polo (this is one of our main target audiences for using bitshares), is that having to pay a fee for a cancelled order is the thing they hat,e nad is making them not want to use bitshares.
Imo, the make order/cancelled order fee should be made as low as possible (only nonzero to prevent spam). For ALL users, not just lifetime.
Transfer fees and fees for an order that actually executes can be high as they are now.
I think this needs to happen in order for Bitshares to have any traction among traders.