decentralised crave wallet exchange...

lets say both of us have our crave wallets open. on the top of wallet there is a buy/sell button. i want to sell some crave today so i send 20crave to the masternodes network and i leave a price and bank account number. you decide you would like to buy so you check the buy box and a list of current sellers will appear , number of coins(in this case ,my 20crave) and price then buy now button. you click buy now and the bank account number appears, when you do this my wallet (seller) is given an alert that a payment has been made, i click confirm after recieving the payment. the masternode releases funds to you.

the gd thing is the banks would never know what you purchased from me, it couldve been an item from gumtree.
also there could be less fees with this as currently there is two fees when buyin crave, fiat to btc,then btc to crave and on both occasions the xchange is the one who makes the bit of profit...
but with this idea the masternodes could take 10x less in fees and still be paid a tiny bit ;-)
this could also prevent the problem about whales and walls.