Are for-profit online charter schools delivering?

From The New York Times: By almost every educational measure, the Agora Cyber Charter School is failing. By Wall Street standards, though, Agora is a remarkable success that has helped enrich K12 Inc., the publicly traded company that manages the school. A look at the company’s operations raises serious questions about whether K12 schools — and full-time online schools in general — benefit children or taxpayers, particularly as state education budgets are being slashed.