It’s not surprising to find that education is a huge market:
The K-12 market is tantalizingly huge: The U.S. spends more than $500 billion a year to educate kids from ages five through 18. The entire education sector, including college and mid-career training, represents nearly 9 percent of U.S. gross domestic product, more than the energy or technology sectors.
I’d be wiling to bet that teachers aren’t going to get a cut at all of this.