Why do we have to pay for certain types of information?

Mostly for scientific and research articles, from journals mostly,... all you get is an abstract and if you want to read the full thing you have to pay like $30. Shouldn't it be free? Like what if someone, like me, is doing research on a topic on their own time (so it's not like I can get articles through my school library or anything) and wants research based evidence? Is it fair? and what about poor people? they certainly don't have the opportunity to learn when it's so expensive, especially with going to school but that's a different topic...
.... it's just annoying...
??????????
 
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