I hold conflicted views on this issue. I don't want to inhibit authors from publishing, as I love books. But often they are too expensive. So, about 50% of the time I pay for them, and 50% of the time I get them from sci-hub.
And certainly paying for scientific articles is a big rip off. It effectively means that once you are no longer enrolled or working at a university, your access to this paywalled information is gone.