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I'm treating my Steem Dollars as my spending money and keeping all the SP. Previously I have powered up just about everything

Sbd were meant to be pegged to the US dollar but they have not proved to be very stable. With BitShares Dan Larimar did this with the bitusd and it has proved to be a rock solid peg. Even during the recent sell off where all alt coins suffered major pullbacks the bitusd was pretty well stable at $1.00. Those who traded into it during the sell off locked in all of their profits and could buy back into other alt coins at a much lower price.