NO! Yacht charter can be the cheapest way to travel Greece, if you make the right choice. If you charter a sailing yacht, for example 45 feet with 4 double cabins that means you can have a company of 8 people onboard. The price for a 45 feet sailing yacht is about 2700 to 3000€ for one week. Let say that you spent 300€ for petrol an 1000 to 1200€ for a skipper, that means that you have to pay 500  to 600€ each person for a week! And in a yacht you can make your own food, so you can save money from restaurants, tavernas etc. And the greatest advantage is that you can go wherever you like you can jump from island to island every day, discover unreachable beaches and live unique moments.