Debtor refusal to pay is a risk a creditor had better take into consideration. That's one of the reasons creditors demand interest on a loan. Whether the debtor not paying is reasonable or immoral is another thing all together, but a debtor can choose not to pay - which may cost the debtor too in access to future credit or even jail, or in the case of a sovereign even war.
Agree completely. volpunter continues to get angry at the Greeks suggesting they won't repay - but this isn't a moral discussion. It's a practical one. They will default eventually. It's just a matter of when and how much money is lent to them before it occurs.
ops: If it is all-in there are no possibilities to rob anymore.