Why do we keep using that number in a thread about a guy offering 67.65% APR? That interest rate is still ridiculous so there's no need to overstate it. I think it's pretty easy to generate plenty of funds to cover this rate. Considering bitcoin fell ~30% in the last few weeks I also don't think it's unreasonable to offer a little over twice that per year for protection. The thing I totally agree with you about is the "guarantee" It's more likely the issuer thinks it's low risk and willing to risk reputation on that fact. As the holdings get higher, reputation means less and less.