It's not against the "rules" or anything, but a lot of the bro-science behind eating every 2.5 to 3 hours has been debunked.
I used to follow the 6-8 meals a day and I was just hungry all the time and now that I don't do it, I notice what a pain in the ass it was to always have food ready.
If you are a professional level wakeboarder (or any athlete for that matter) your nutrition and caloric needs will be entirely different than someone who is doing this WOL for losing fat or to better their health. I play lacrosse on a semi-pro level and only eat three times per day (usually, and I don't start eating until after noon) when I am in season. When I am not in season, I usually wait until between 2 and 4PM to eat and eat only twice up until 9PM. I actually perform better having not eaten for at least 6 hours. But, never having wakeboarded, I wouldn't know what your requirements would be.