Don't worry about Skiathos - No McDonalds that went two years ago its now a boutique. Strange how many people remember Skiathos for that reason.
There was a change of Mayor a couple of years ago, and he has done a cracking job. The Mayor was re-elected in October and again is spending money improving the island facilities. First it was the beach tavernas, then the harbour area where the pavements have been transformed, roads improved and relaid. Who is paying for this - the people of Skiathos through their taxes.
I visit every year, and yes prices went up with the euro, but the lower end of the market has been removed. Skiathos is not called the St Tropez of the Aegean for nothing. If you want to pay a lot and sit on a cushion with a cocktail - you can, if not there are plenty of places where you do not have to.