If you think Greece will do better without EU you are wrong. You will end up as Macedonia, Albania, Bulgaria or Romania (last two will do probably better) so I don't think you will like it. Also your credibility will be destroyed because if you decided not you pay your depts nobody will borrow you any money in next years. You have problems with collecting taxes, you overspend money on public sector and social system and you have other problems too. Your country doesn't have strategic position so I don't see a reason why would anyone move manufacturing to Greece instead of Poland or Romania or similar countries where it is much cheaper.

You were quite lucky you were only non-communist country in that region 30 years ago and you joined EU. EU for last 30 years was sending you approximately 6 billions EUR every year.

At least you are popular tourist destination. Good luck, I wouldn't want to be a Greek.

PS: I am not a German.