Actually whenevery that glitch comes up in my game, I take advantage of it. You always have a teen in the house, so there is no need to worry about a babysitter for younger children. Your teen doesn't need to go to school and can stay home and work on skills, keep up the garden, keep the house clean without penalty. On the other hand, I dont' send my kids off to boarding school often, so I can't really speak to the downside of not going.
The downside of not going is that you have a teen around to pull pranks, make a mess in the house, wake up in a bad mood and get in everyone's nerves. If you have one of *these* teens the Boarding School is a MUST.