I really noticed this once I found myself at the community college. The school liked to market that you were educated by “working professionals with industry experience.” which translated to the school paying them less than their second, full-time job on top of all the stuff about them not knowing how to teach while they were in charge of the grading of 20+ classes per semester. Prior to that in my experience I had only ever come across professors who were incredibly passionate about what they were teaching or alternatively were incredibly passionate about teaching-itself. it was eye-opening in the most frustrating way.