Why is the DVOL volatility index of BTC so low, and selling BTC options is still cost-effective. As shown in the figure below, the implied volatility of BTC is about 9% higher than its historical volatility, indicating that the risk premium for option sellers is still quite high; Compared to ETH, even if the DVOL is very high at 73; However, the historical volatility is 83, which is 10 higher than the implied volatility. Compared to recent historical volatility, the seller's risk is actually enormous.