I'm not suggesting that the college textbook market has been designed by moustache-twirling evildoers, just that we should look at, as you say, the observable dynamics in the system. Regardless of market dynamics I think it's immoral to restrict academic knowledge to those who can afford it, when it can be distributed at 0 marginal cost.
Scientific papers is also not your typical market. I remember reading that university libraries are somewhat compelled to subscribe to the status quo publishers, even if they are disliked. It's an industry where pedigree and tradition is quite important.
I fully agree it's good analyze why the system outputs what it does. I would question the idea a lot of the observable dynamics in the system have been consciously chosen for. That's not to say we shouldn't make the effort now though.