Well this kind of loans should stop being made even with such gree reputation,otherwise we will start to see these accounts to get sold and people scam others with them,nothing personal,i believe all should provide colateral.
I would have lent .1 BTC to the OP if marjod had not beaten me to the punch. I have made no collateral loans to others who also have a solid trading history in the past with positive outcomes.
Giving a no collateral loan is not very different then trusting that person enough to send first when trading with them.