I agree, there are many ports in Turkey, but half of them are designed for big ships with cargo, you can't sail a yacht there. In my opinion, yachting tourism is best developed in Greece, when we rented a yacht there through GetBoat
https://getboat.com/ we could hardly find our booked vessel because there were so many moored yachts. And in the open sea we often met tourists who decided to have fun as well. Many people also choose Thailand, but the cruise industry is more developed there.