My understanding about the post to the announcement which Jason shared is that they are saying: Supply mining(only 7.7% of the 8.12%) is an amount which is earned on SUM(Total supply -Total borrow) Therefore, 7.7%×(1000-1000)=nothing basically! So you only earn the base rate of 0.42% as you don't qualify for the mining In conclusion, you pay 5.19% to borrow and only earn 0.42% which means your profit is 0.42%-5.19%=-4.77% in other words you are guaranteed to lose money by doing this! I'd love to be proven wrong but with respect and calculations.