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In graduate level, or even 4th year level courses, the contents might change occasionally, but the contents of textbooks for first year courses haven't changed in about 50 years. Putting out new editions of "First Year Physics" and whatnot every year is a money grab, pure and simple. The schools do get kickbacks, which is why the system continues to exist. The whole works is designed to fleece the students as much as possible, which really pisses me off from the point of view of an ex-academic. Money-grubbing publishers and school administrators have poisoned the well, and the academics are powerless to change policy. Bah!
It's best not to mix textbooks into the general discussion of Fair Use, since fairness towards students went out when schools became businesses.
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