They're not trying to charge for access to the ideas. They're charging for the explanation of those ideas in text that a team of people crafted. They're charging way too much for it, but that's only because universities let them.
Exactly. The ideas are already out there. Charging for information that's out there when you have a semi-monopolistic hold on the market through the collusion of most higher institutions of education is unethical.
I would. It has much further and deeper implications in the bigger picture than just that one textbook that you could afford.