I work for a scholarly publisher and I'd be very interested in hearing about what—aside from cost—would cause you to go to Sci-Hub for a paper? Is it reading

I work for a scholarly publisher and I'd be very interested in hearing about what—aside from cost—would cause you to go to Sci-Hub for a paper? Is it reading experience? Site performance? Difficulty in navigating publishers' sites? Are there any good experiences you can point to? I'm really interested in making this better.