I invested a couple thousand back in 2008 in prosper.com. Took some hits during the recession and have had a steady small amount of loss due to non-payers over the years. I've lost the equivalent of what I've put into it and I have made in profit about half of what I put into it over the years. I have gotten wiser as to who I'm willing to lend money to and am only willing to lend to the safer (better credit) people and take a lower interest rate rather than gamble on a higher return with a riskier person.