You can earn above average rates of return because peer-to-peer lending eliminates the bank function. That means that you participate in nearly the entire interest rate being paid by the borrower, rather than the less than 1% that you will typically earn on certificates of deposit. And you can reduce your risk by investing in slices of hundreds of different loans.
Sorry to hear you had such a bad experience with Clickbank. Refunded 5 weeks later? That’s pretty extreme! I could not find any info on CB on whether gravity takes into account refund rates, but from other blogs, I read that NO, it doesn’t take it into account. The Earned/Sale category however does take this into account, which is why the average $ earned per sale will sometimes be different from the actual commission you make.