Two things:
1. My daughter recently had to fork over $110 for a basic community-college ALGEBRA textbook. This knowledge has been around for centuries. Other very basic textbooks are similarly astronomically priced considering they rehash the same basic ideas as the 10,000 that have come before them.
2. We have no idea if the huge margins being made on textbooks are being passed along to authors.
Textbook companies like Thompson have slowly muscled out competition by such tactics as out-and-out bribing instructors: http://chronicle.com/free/v49/i42/42a00801.htm It's corrupt. That doesn't mean piracy is always justified. But it's not as simple as you are arguing..."pay up or return to the dark ages".
You don't have to know how the computer works, just how to work the computer.