My advice for those willing to lend at btcjam and similiar is to avoid there is no warranty you will get your investment back or either paid from the person which requests, soo gamble your money at your own risk.
Well, it's not really gambling if your smart about who you lend your money to. I personally think the best thing you can do for yourself when investing is to diversify the holdings, so don't go ahead and put everything you have into one loan as if that fails then-- you're done.
Simply, don't put all your eggs in one basket.
Good luck!
Look im not talking because i didnt used it, i were a lender at btcjam, i had supported more then one project i were able to recover my investment and roi some satoshis, and i loose a lot on the way, they dont offer you any colateral, soo anybody can go there expose their details or from someone else, ask the loan and dont repay, soo its better gamble at casinos then try to profit at those websites.
Bitcoin isnt ready to fund projects that way, bitcoin loans need colateral to keep community honest.