Higherfaresrationavailablecarsbywillingness topay: to richerusers, insomecases, but alsotothose less able towait outthesurge period orwith fewergoodalternatives.
That dynamic is a mix of roleplaying rules (levels, experience points, etc) with wait-or-pay rules (energy, building with clicks, paying to shortcut) and guided goals through a repetitive activity (digging, questing, item assemblage).
So in the aftermath of a default, creditors would in theory have to sit still and wait over many years to find out what Greece either could or would want to pay back.