I have pasted my primary comment from this forum below so you don't have to find it

"People don't seem to understand that you can't have it both ways. You can't hold a fixed 10% limit of SBD/Steem and then hold the peg. You could hold the peg temporarily if you had unlimited ability to print SBD, but as a debt instrument if you printed too much then after some downward movement if everyone called them at once for conversion to get their 1 USD worth of Steem , it would collapse the value of Steem. A hard pegged SBD is a stability problem for the instrument which has to underwrite the stability. This is why it was designed as a soft peg in the first place with a limit on supply as a % of the market cap of Steem. SBD goes down interest rates can bring it back up , in contrast if the SBD goes up it will increase author rewards value and increase conversion of user SBD into Steem, which in turn as the steem price goes up further increases the supply of SBD in payouts up which puts more downward pressure on SBD.

Fixed pegs just don't work; unless you match them directly with the underling asset (ie this would involve banking one USD in an fiat based account for every SBD , just look at the conjecture about Tether and if they are actually doing this). You can't just print money on a real world pair without having something backing it (just look at the relative value of a USD denominated bank account in Zimbabwe held with the new USD pegged Zimbabwe dollars) . Financial systems have to be stress tested for extreme fluctuation so the whole system does not collapse. The recent price spike and subsequent increase in supply of SBD and lowering of the price of SBD is a system that is working, not broken. This is how it was designed to work. Stability in currencies comes from having large stable GDP being transacted in that currency. Its the incredible volume of regular nominal monetary transactions and flows which creates the stability. You can't create a stable currency then invite commerce. You have to bring commerce to the currency, then when the nominal transaction based flows dwarf the speculative flows you will end up with a stable currency. So unfortunately its a little chicken and egg, and simply takes a long time to develop those transaction based monetary flows."