Its high price obviously benefits the authors now, while does not harm any others except poor speculators.

Agreed, the Korean speculation money is literally subsidizing the entire steemit community at this moment, hopefully there are not too many angry bag-holders when they discover you can just print more at the push of a button. I hope not too many new users here believe the SBD price is a new norm, as they will be in for a shock when they realize what SBD are really supposed to trade near. Currency pegs never really work as intended, and take too much to keep going.