Decentralized exchanges are coming soon, they will suck all traders from website-exchanges. NXT is going to launch their "DEX" soon,  you can then trade coins inside your own wallet/client with very small fees and not need to fear that website is shutdown/hacked and stealing your coins.  And NEM is also doing their own "DEX". That would be a huge thing for Sharecoin to make it's own "DEX". But might be a hell of a task... Maybe in the future ?