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I just got tenure, and dropping the 'don't rock the boat' mentality has taken some getting used to. Anyway, I got an email from a textbook salesperson today, and told them why I don't use textbooks in my classes. 
This is a classic collective action problem, but if more of us demand industry reform before buying textbooks, I think we could have an impact!
Just want to add: I don't think the authors are responsible for this. In my experience, they are genuinely trying to help educate people by making great books. The pricing is decided by the publishers, and they're doing the capitalist thing of charging as much as they can.
Finally, I want to give a shout out to @ChrissyCSpencer. I used to happily use a textbook, but then she told me about the burden on students of $1000+ per year in book costs (many do not have the $), and I saw the profiteering practices of the publishing industry in a new light.
