My daughter's Language Arts teacher has asked me to come speak to the class after Winter Break. I'm looking forward to it. Kids are great, inquisitive, and very, very smart. Plus, my daughter was elated that her mom was going to be a guest speaker.
You never know when you might have ingited something in a young person...and they grow up to be the next Hemmingway.
As for book sales....several of the teachers purchased my book, and had me sign them before everyone broke for Christmas. Doesn't get any better than that. Oh, sure, it's not the sales numbers that will make me a Rowling, but it's flattering, and all those potatoes begin to add up; furthermore, this provides me with the experience of speaking to a group regarding my work, and writing techniques. Trust me, kids are a hard audience; they see through faking it, and have no qualms shooting questions up at you, making sure you're the for real deal.