This "teacher" notes this method works at conferences, but this is where all the attendees want your product. What happens in the classroom where there are thos

This "teacher" notes this method works at conferences, but this is where all the attendees want your product. What happens in the classroom where there are those that couldn't care less about your product, you, or the subject you are trying to keep them engaged on? As another poster mentioned - she is hitting on some of Gagne's points but if she were to include the others she would be at instruction which is...teaching. Thus I could use any other profession and say something like "Engineering is teaching" and the fact that I gather materials is somehow going to translate into why every teacher should also be an engineer. The good/best teachers are not just salespeople, but also engineers, chemists, historians, philosophers, lawyers, and all sorts of other professions wrapped into one person teaching about a subject that not any one of those single professions covers.