I doubt he's motivated by a financial interest, if that's what you're suggesting. What he certainly has a stake in is maintaining the social status that college degrees give you. He put years into getting a PhD, and if he's teaching undergrads, that means he devotes a lot of time to helping other people get college degrees. To someone in his position, "glorifying dropouts" devalues his accomplishments and his work, at least in the eyes of others.