Hi Drew, thanks for your question. Il try my best to answer. The idea of Steemdollar is to be a stable currency that can reward the content creators with stable amount of money. So Steemit upvotes are paid in Steem dollars and Steempower (mostly SBC). It is true more SBD are created to keep up with the inflation and increase rewards, and this rate is roughly at the rate to keep it pegged to $1USD. The reason they removed interest from Steemdollars is because people were hoarding the Steemdollar, causing the price to go up. So for example, on Coinmarketcap, when you see the existing supply of a coin, it is not the total supply of the coin that has been minted, it is the amount of coin that is "Active", meaning on the markets in the last 30-60days. So if everyone is hoarding Steem dollars the "active" SBD goes down and the price goes up. Especially in a down market like now, some users are hoarding SBD and that is why we are above $1USD. If everyone sold thier SBD to Steem or Steem power immediately, the price would drop back to $1 USD. Hope the above makes sense to you. This is my understanding at least, if someone else has a clearer explanation, that would be most welcomed :)