SBD is already trading at higher than its $1 USD target price. Paying interest would only exacerbate this problem. The interest rate is therefore set at zero partially as an attempt to restore the $1 USD target, or at least prevent additional drift higher from it.
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Why is the STEEM Backed Dollar trading for more than one dollar?
Nobody is really sure why, but its been trading at nearly double the target (so...$2). The only answer I can give as to why is "supply and demand".
Up vote for "supply and demand", for sure.