[analog31]

People also need to realize, college instructors aren't paid to teach. They're paid to research and so of course they'll be lazy on sharing what they've learned from teaching. Universities have teaching centers, but those can only do so much when you really need to also be talking to fellow instructors in your specific field since every topic can't be taught the same.

I was a lecturer in math and engineering for one semester at a big ten university. Most college teaching is done by adjuncts, who have no research responsibilities unless they're also holding down a separate research job or trying to do scholarship on their own time. They have nothing to share because they don't last long enough to develop real expertise.