Funny you should ask this because I have just moved away from the area I lived in for 18 years. The short reason is that we enrolled our children in a new school 65 miles away from our home and did not want to commute.
The long answer is that the school district, with the exception of the grade school, was lacking academically. I lived in a mountain, resort community where there was snow and cold temeratures and I had to drive an hour to go shopping, to the movies, or out to dinner. As well as activities for teenagers was next to nothing.
Now I live close to everything, even close enough to bike to and I'm loving it!