Greece may officially be on the edge of collapse, but so far the welfare payments are continuing. That is what is attracting immigrants, and that is why the Greeks are finding themselves needing to expel all the immigrants they can lay hands on, in order to stay afloat for a little while longer.
Right now, it's all a game of "what can we do RIGHT NOW that will hold off collapse for a few months, weeks, days?"
While the Gleeks are still making payments to everyone who was getting one they actually are cutting them by as much as 50% so far and that includes not only welfare basket cases but public employees also. On the public employee side they have had a couple rounds of layoffs already but still have too many trash pickers on the rolls.