you call it bitUSD and here is no problem?
then call it bit% - bitinterest - btsinterest - bitUSD%
"If you hold bitUSD for a long time the collected fees from the market transaction will be paid back as an (insentive, reward, interest, dividend) to the bitUSD holders. This will slowly increase the holders bitUSD amount. The future will tell how much of gain you will get from holding bitUSD but we expect something between 2-5% every year".