Why not submit your site to that community for review (assuming it's as relevant as you say) and get a real star rating in the process? Your listing would look the same as your current ad and you presumably wouldn't be paying to advertise (unless the site accepts only paid submissions).
Because BCC's landing page / free trial is superior to the experience of the organic site, for both teachers who want bingo cards and for me. If it were one of the organic listings, I'd have to manually create 8 cards or whatever and then upload them. They'd go behind a signup wall. People would then be asked to signup to the site to download the eight cards. Very few of them would buy BCC. Instead, they should sign up for my site, where a) they can create more cards and b) the ones who experience a lot of value from classroom bingo will actually pay me money.
