How do you come up with that number? According to http://www.edreform.com/Fast_Facts/K12_Facts/#ENROLLMENT, there are about 130,000 elementary schools in the US. Even if every single school in the nation used IXL, they'd only reach $25 MM in revenue. Given that IXL probably reaches some single-digit percentage of schools, $100 MM seems really high. Are parents buying this in droves?