So what happens when I borrow money from a bank to buy a house and I default on my loan? "They took a risk and lost"? Hooray. I get to keep my home.
I'm not an economist, but I don't think that, in the case of Greece, the "house" (whatever it stands for) was used as collateral.
I don't think there really was any collateral. I guess lenders just hoped that Greece would pay back, or would be pressured into paying back.
At least, I hope not.