SBD are Steem Backed Dollars and are supposed to be pegged to one dollar making them a safe haven when the markets start declining, they aren't supposed to fluctuate much past or below 1 dollar. We used to get our payout rewards in Steem, Steem Power and SBD, but for the last 2 months or so have only been getting payouts in Steem Power and SBD this was to try and push more SBD on to the markets and drive the price back down to the one dollar mark.