It says buy or sell Steem, not SBD which is a bit misleading. Not sure how to use this tool, but it looks similar to Bitshares which I am familiar with. Somehow, it seems reversed from what it should be. I assume one would use buy Steem and use the SBD in your own account?
This represents a fee of about 3.3% which is a little better, but still a bit steep and more confusing.