I am not sure about the proposed fee charged to place an order in the book, I imagine most people will just pay the fee one time and then change the existing order to avoid paying more fee's, for example you could place a sell for 100 MSC at 0.15 and after it is sold move your order to 1 MSC at 0.9 or something that won't be purchased, then next time you wish to place an order change it again.
So if you proceed with this you might as well just charge everyone a 1 time fee to use the order book, still not sure if that's the best idea - it may just discourage people from using the order book at all for standard trades and they will just be posted in this thread instead.
Also I think a lot of the problem at the moment is that once peoples trades have been filled they may not bother to post in here to remove the order, adding fees to place orders wouldn't really fix this - unless there was some kind of system where you pay 0.01 or whatever and are refunded 0.005 when you remove your order, this just creates more work needed to run the order book though so may not be viable.
I suppose one way you could do it is to set up a bitcoin address for the order book, all orders must send 0.01 to this address with a message containing trade info and link to bitcointalk profile or something. Once the order is filled they must send 0.0005 (covers the miners fee) from the same address with a message to remove the order, and then 0.005 will be sent back to the same address and the order removed. I suppose there could also be a option to send 0.00006 from the same address with a message if you wished to change the order.
Anyway that's probably all too complicated but just suggestion to think about
If it was me I don't think I'd bother adding fees to place orders as it seems like it will create a lot more work.
So if you proceed with this you might as well just charge everyone a 1 time fee to use the order book, still not sure if that's the best idea - it may just discourage people from using the order book at all for standard trades and they will just be posted in this thread instead.
Also I think a lot of the problem at the moment is that once peoples trades have been filled they may not bother to post in here to remove the order, adding fees to place orders wouldn't really fix this - unless there was some kind of system where you pay 0.01 or whatever and are refunded 0.005 when you remove your order, this just creates more work needed to run the order book though so may not be viable.
I suppose one way you could do it is to set up a bitcoin address for the order book, all orders must send 0.01 to this address with a message containing trade info and link to bitcointalk profile or something. Once the order is filled they must send 0.0005 (covers the miners fee) from the same address with a message to remove the order, and then 0.005 will be sent back to the same address and the order removed. I suppose there could also be a option to send 0.00006 from the same address with a message if you wished to change the order.
Anyway that's probably all too complicated but just suggestion to think about
If it was me I don't think I'd bother adding fees to place orders as it seems like it will create a lot more work.