It's not just readers who pay. Scientists also have to pay some journals to get their work published (assuming the submission went through) which is totally backwards. Scientists do not get anything monetary from what the readers pay. Now look at other publishing industries. It's the publishers that pay the creators (even if the rates may seem unfair at times, it is still far far better than negative gain for scientific research content creators). Been there multiple times back when I was a PhD student. So I have absolutely nothing against those who use the free sites.