Rampant tax evasion is a cultural thing from top to bottom in Greece. Two out of three Greek workers cheat the taxman. Last year an estimated 24% of all economic activity in Greece went undeclared to evade tax and regulation, well above the European average of 19%, according to Stephen Hall, an adviser to the Bank of Greece. http://tinyurl.com/qzfoyxz
The troika loaned them money with terms. That's what the voters were fed up with. I don't blame them, but they should have said no to the bailout in 2010. I don't know where you think "they will get plenty of money" but imo, they need to get away from the EU(especially Germany).