The salary is frankly embarrassing to share with my peers in industry.
But not all of us take it out on the students. I find free books whenever I can for my courses. I even write books and let the students (and everyone) freely use them. If there are good for-profit books out there, I only use them if they're cheap and something useful beyond college.
I got it from Dad, who was also a teacher. He got tired of book prices and wrote his own. Students still had to buy it, but they could do so at cost at the college print shop. Dad made no money from it.
Demand for those jobs is extreme. Meanwhile the ranks of tenured professors are shrinking as colleges make more use of contract teaching staff.
And even if you were a professor, if you’re not bringing big money you’re not earning a great salary either. Go look on Transparent California and see how much tenured faculty at a CSU are making.
Say the textbook used for the last 5 years costs $300 and now you want to switch to a different, cheaper book. Now you have to convince admin (why switch? The previous one works) and students (I pay $$$ tuition, why are you cheaping out on the book? Is it worse?).
> how much royalty do they get?
Basically nothing, so that is obviously not the reason and you should be ashamed of yourself for suggesting that.
You might consider providing a more concrete example if you're going to throw shame around. This answer feels emotionally charged and incomplete.
Exactly what I am calling out. Thanks.