I'm suspicious of fields where teachers sell themselves to students harder than students sell themselves to teachers. The field may be deep and meaningful but its pedagogic culture may be a lemon market due to low teachability.
Used cars are great. Used car salesmen not so much.
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This could also be due to shift in how we teach. Traditional teaching doesn’t scale — it has limited supply, so the value of advertising is limited. Video courses/MOOCs scale. Each new student is essentially pure profit, so the upside of advertising is high.
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