The best policy makes HBD reasonably attractive to hold but not so attractive that its supply grows at an unsustainable rate. This depends a lot on competitive factors, both USD interest rates and other DeFi rates, but also adjusted for risk and liquidity. Right now we are probably about right given that funds are neither flooding in nor fleeing. The reason we're much higher than USD or other DeFi rates despite being largely in balance are the risk and liquidity factors that weigh against Hive as a smaller platform.