Wave Powered - Alternative to Sails?

Just some thoughts about using wave power system to augment a sailing ship. Seems like a huge advantage in terms of cost and longer term performance (since the entire idea is a ship that is cheap, it fits fairly well). Here are some links. https://folk.ntnu.no/eirikbo/waveprop...    • The Wave Glider: How it Works (with audio)      • John Hilton Wave Boat