The ones who do have a high toss obviously are more susceptible to the wind, but other than that, a lot of serves with high ball tosses just are error-prone in general. Take Sharapova's or Ivanovic. It begs the question; why don't they just toss lower? I know they have their own distinct serving style which they're stuck with, but are they stuck with a bad habit? Does having a very high ball toss hold any advantage over tossing the ball just high enough to get your ideal contact point (ie. Dolgopolov, Monfils, Roddick)?