Because you can’t trust Greece or rely on it to be open for business and entirely safe. You never know when a group of hooligans will set fire to your car, or throw hunks of marble at you in the street as you’re walking around Syntagma. And you CERTAINLY don’t know when there will be a large strike, which might close the airport and delay your flight, or if you manage to get there, close the museums/monuments you are there to see. Basically, until Greeks can get their acts together and stop whining about the state of the country and just be adults and go to WORK everyday, rather than striking all the time and destroying the city: it’s just not worth the risk. Why go to Greece when you can just go to Italy? The beaches there are lovely too! :) Honestly, I don’t think Greece deserves the tourism right now, with the sheer disrespect they are showing their own country, and the rest of the world. Do you think the tourism offices have been off limits in the past few years when the rioting gets out of hand and everyone starts burning the buildings to the ground? Nope. They clearly don’t care that tourism is the only thing hanging them by the very thin thread that keeps them from being a third world country… so why should anyone give them their business when they obviously don’t appreciate it?