BarMax is an app specifically designed to prepare you to take the California bar exam. It's a massive piece of software (probably because bar exams are pretty massive too) and it's priced massively as well, a thousand bucks. But that's still a bargain compared with how expensive bar exam prep materials usually are. The company that makes BarMax says it's selling well, they're profitable, and they're rolling out a New York version soon. The popular wisdom has always been that apps need to be cheap and need to become profitable by number of sales. Perhaps not so. It kind of proves the web content maxim too that people will pay for dedicated information more than general.