You forget that Steem Dollar will go back to 1 Dollar in the mid to long term. Steem could profit from that because due to the high SBD price autors earning more money for their post and use the SBD to buy Steem and use it for powering up. Here is how the regulation mechanism works: https://steemit.com/steem/@sevenseals/why-the-steem-dollar-sbd-will-fall-back-to-1-us-dollar-the-self-regulation-of-the-sbd