Sustainable to me would be the Hive network only has to pay 1.5% a year in Hive market cap to sustain a massive 20% HBD apr. This is absurdly worth it, as offering yield this high on a stable coin should easily get enough attention from outside value coming in to sustain itself. It's legit just free money on the table until the ratio actually does increase, which it hasn't. Been stable and crab-walking for a while now. If it gets above 10% I'll maybe reconsider my confidence level.