Little late for them now, considering they can only withdraw 60 Euro/day.
They can earn bitcoin by accepting it as a payment method.
They get a lot of tourists, people don't carry much cash around with them, bitcoin might be the alternative.
Right now, I don't think that bitcoin can help them much.
Because of the political crisis and uncertainty tourists already giving up from Greece.
And how many of these tourists even used bitcoin or knows something about it?
While the situation in Greece is not resolved, any alternative payment methods will not help them much.