Yes my rates were higher initially in order to get some smaller loans funded and to establish a reputation. They seem to be all over the place because I slowly have built them up.
As for my return, it's per month! not per term of the loan. I am paying less because I am established and trusted and honestly could come up with the funds myself if I had to.
I repaid 273 bitcoins in the last few days to my investors on BTCjam. When those loans were taken out the investors would have paid anywhere from 11-13 per coin. So they made a considerable return on their investment.
If I were a scammer I would not have repaid those loans. The 300btc loan currently active has two payments left on it. So, technically I have only 200 borrowed right now.