At any given time, then, there will be a sizable amount of euros flowing into Greek bank accounts. Even if some of this is immediately withdrawn and sent abroad, a snap shot of the Greek banking system will make this flow of deposits appear to be a steadfast stock.
But there’s another reason some Greeks aren’t withdrawing their deposits—they plan to benefit from a devaluation. A Greek who owes a large euro denominated debt to a foreign bank or business would benefit from the devaluation of that debt. Under any likely scenario of a currency change, Greek courts would consider the debt redenominated into the new devalued drachma.