Some crews are so popular they have the same charterers coming back year after year, regardless of what boat they are running. There are many sizes of Power Yachts, some fast, some not so fast, but more economical on fuel. The charter price will vary, depending on the age and condition of the vessel. The owners set the prices, and not the market. An owner that uses his boat a lot will set an higher price, while others may need the business more.
Sailboats are the best value.
They are usually more fun for kids. The crews are good sailors and generally younger. With sailboats, most of time you get a cabin with a berth and a shower, on power yachts you can get a large stateroom with a king or queen size bed and a bath tub. One of the best things about sailing is that don't have to pay for a ton of fuel. Catamarans have some nice advantages.