Ya, pretty much what migs said is the reason.
I do it. I find it puts you into a rhythm and helps set a good egde. Once i put my other hand on the handle i begin to cut harder and harder. I first noticed it with wakeskating. BT would do it all the time.
2:06
from Byerly Boards on Vimeo.
from Alliance Wakeboard Magazine on Vimeo.
from Alliance Wakeboard Magazine on Vimeo.