You can compare the price of college textbooks to the price of textbooks for professionals and you will see there is no difference. It's simply a niche market.
Personally, I prefer decade old textbooks, hardcover, beautifully typeset, clear diagrams and equations, black and white. Of course that doesn't exist for every field. But try to imagine the complaints you get from students for teaching from 'obsolete' textbooks that aren't even in four color print.
Personally, I prefer decade old textbooks, hardcover, beautifully typeset, clear diagrams and equations, black and white. Of course that doesn't exist for every field. But try to imagine the complaints you get from students for teaching from 'obsolete' textbooks that aren't even in four color print.