if they just default and tell their debtors to go f' themselves, wouldn't that put them on a black list for credit - from anyone?
haven't wars been started over stuff like this as well - debtors coming to claim what's theirs?
Not necessarily. Iceland, who's crisis was as bad if not worse than (some of) the PIGS,
basically did default and their bond spreads are lower than Ireland's. Iceland has its own currency as well, so it can inflate its way out of debt rather than have to suffer painful internal wage deflation (where the PIGS are stuck due to being on the euro.)
Your bond spread will depend on the risk the market perceives of you being able to pay it back. Its not like some CC agreement. If your economy sucks and has little capacity for growth, you will pay more. Iceland is seen as a more viable econ than the others.
Greece is hopeless. Austerity measures and internal factors are leading to Neg GDP growth, falling incomes, and lower tax receipts. If the value of your debt is not decreasing w/ net inflation, how do you ever pay it back? You can't. Devalue currency to become a more competitive exporter (like China) and decrease the real value of their debts? Can't, they don't control the euro. Ergo, high rates. The bailouts benefit their creditors (Germany, EU banks), not the Greeks. They are just buying time hoping for a miracle that won't come, that's why they keep coming back to this crisis every year or so with a bigger bailout and worse terms than the last.
is it feasible for greece to leave the single currency and go back to their own? at least at that point, they'd once again be a cheap vacation spot for brits etc (i assume their own currency would have a poor exchange rate) and would probably get a big increase in tourism/money bought into the country.
Basically this is what they need to do, but Germany, France, eu banks, etc don't want this to happen as they hold the debt and benefit from the currency. If Greece leaves they may start a trend that no one knows where it will stop. Way too many weak countries were let into the eurozone and are getting Fk'd by it now.