There are many very good insights in the comments already. I would add that the website doesn't work hard enough to establish credibility and trust, which is ve

There are many very good insights in the comments already. I would add that the website doesn't work hard enough to establish credibility and trust, which is very important when dealing with a service where reliability is very important (I guess that you have a lot of manual input to do, and you don't want to lose your work...). I'll add that my father (a retired teacher) sold some educational software that he created himself for years and it was mostly teachers who bought it to use in the classroom. He didn't make a lot of money (also because you could download the same software for free from the internet), but some teachers were definitely willing to pay for something that they valued for their work - at least here in Italy, but I guess that's also true in the US.