People have many reasons for choosing an online high school. For teens, one of the more common reasons is that you do something better than a lot of other people. Take, for example, Erin Vierra, who is a student at University of Miami Online High School. As it happens, she excells in tennis. She is ranked #1 for the under-16s in the New England region (and, let me assure you, they play serious tennis in New England!).
However, getting to be ranked #1 means that traditional public school attendance will, at best, be difficult. This is why Erin and other student-athletes elect to go online for high school. It frees up the days for your sport, but you can still get a quality education.
For the entire article in the Norwell (MA) Mariner, see Local Tennis Star Thrives.