$300 is significant membership fees for mere privilege of being called member of some society. I'm a member for few years now and have yet to experience any real value provided by IEEE memberships except to get spammed ruthlessly and get some discount to even more expensive conferences of theirs. Remember, even after paying $300 you don't get access to their closed publications (you just get privilege to pay "discounted" price of $13 per paper).

All these tells me this is enormously blotted organization mainly providing vanity and have no real mission. There are tons of non-profits that operate this way with their lavish expenses and highly-compensated officers.

If Elsevier was non-profit with nicely compensated "officers" then would you be ok about their ways?

Are you based in US or a European country? The whole point of projects like Sci-hub is to help people in poor countries where $300 is insane amount of money for getting access to a journal.