Isn't it very unfair how most Minecraft servers give benefits to those who pay?

Yes, I agree it is unfair how most Minecraft servers give benefits to those who pay. I believe that "Minecraft" should be a game with free features inside of it. You shouldn't pay for the inside content considering you've already spent 27$ or something of that sort on this game. Hope this answers your question.

Eh… Depends, servers do cost a bit to maintain, at the same time there's other ways of getting this money

Yes, but worse is buying a new game, enjoying it, and finding out because you didn't buy it
at Gamestop you don't have the entire game.