Traveled around the world

An Italian couple managed to travel around the world for fourteen months and only spent six thousand Euros. They began their journey in Spain and managed to visit twenty eight different countries. They liked budget flights, hitch hiking, going across water on other peoples yachts, couch surfing and staying in their small tent. It is interesting that although they were traveling with a tent they traveled very lightly. If you traveled around the world which budget ideas would you have? Do you find sleeping in a tent comfortable enough to enjoy it? Which forms of transport do you find are budget priced?