Uhm, I used to lend on this forum and so far I can its profitable. I was ripped off once but I admit it was my bad for not asking a collateral But overall, you can earn much profit with lending on this forum. Personally I used to earn at least 10% profit for each loan, excluding the tips and extension fees. You've just had to follow the, No Collateral, No Loan rule
If the loans are 0.01-0.10 even with 10% profit from each of them you still need a lot of loans to even make 0.1 bitcoins, It's profitable but how profitable and profitable enough to use your time with it?