What Is The Correct Tee Height?

In this Q&A with Mark Crossfield he is asked in relation to a vlog he made a few weeks prior " I use castle tees and stick it in the same amount. There is no enjoyment, would I benefit from tees I can vary the depth I poke them in at?"

Mark's answer to this might be a surprise to you, as many people think you should tee the ball the same height every shot you hit.