Is it really risky to loan XMR (or other cryptocurrencies) ? how likely is it that someone won't pay you back?
If you have no collateral and you are giving out a personal loan it is very likely not to get your money back.
However, if you have collateral you significiantly lower the risk of default. Yes you might have some risk (like the collateral is not good enough in case of forced liquidation) or the service operator will go to bankcrupt (like Gox did with btc).