$145 is roughly equivalent to two days of summer camp that millions of American kids attend. So it's a steal if it works, IMO. If I were trying to build the business, I might offer a discount (or a free summer) to the first 10 kids who agree to have you share their progress here. That would generate a lot of traffic to the site, I suspect, and also be great advertising if your training produces good results.
I coach my kids over the summer, and I can tell you for sure that they are not ready to self-guide using online resources. They just don't have the level of interest in studying the physiology and coaching theory that one needs to make good decisions about what to run, when, where, how fast, with how much recovery . . . etc. So it's not just idiots who could use input like this from a coach.