This is the case in many industries. Movie theaters make money off of marked up popcorn and pop, videogames make money off of DLC and in-game purchases, etc.

This is the case in many industries. Movie theaters make money off of marked up popcorn and pop, videogames make money off of DLC and in-game purchases, etc. When your side business starts requiring you to sabotage your main business to ensure people engage with the "side" part, is when things get interesting. Sometimes it's better to avoid the race to the bottom altogether via regulation, ensuring that anyone who wants any improvements needs to improve things for everybody, or deal with the status quo. That's the logic many Canadians use for vociferously opposing private schools (and I agree with it).