The issue with Smartcoins is that you cannot withdraw the coins you bought.
I have a plan to create a trustless gateway to enable trading of real coins. I'm not sure if a crowdfunding campaign to create this service for BTS would raise enough funds to realize it. Please add a comment if you'd support it!
https://steemit.com/bitshares/@pharesim/feasibility-of-sidechainscrypto-multisig-gateway