>> ... If you are really that afraid that someone in the future will go after you ...
No - that's not it at all. It's merely a respect for what the authors and vendors desire. Also what we all inherently agree to, too, as we purchase from the "biggies."
I am not independently wealthy, and this is the first time this has come up for me. Which mean, I guess, that my wife and I have varied interests in reading material.