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Well, if it is not sustainable, it will probably drop, and return everything to normal. Or am I wrong ?

What might happen is the pump of SBD will stop and the price is steem will rise so people can may not even notice that someone had been draining the system in the meantime. I don't see that as being very fair especially if we have a way to combat it right now. It seems to be to be a flaw in the system, not to mention a problem for people engaged in economic activity. Two examples:

  • I can't set a prize fund for my monthly competition because I don't know how much I will have to pay at the end of the month.
  • I can't agree a price for online work with people because I don't know how much it will cost.