Editors are paid for their work. You pay to post to ensure that people dont SPAM..hmm..like on steemit, which is just a big spam pond. People trying to solve the reason why steemit is failing as a blogging platform are the people who designs things like this. :)
Also, you pay 50 trybe tokens..if you make a good post you easily earn 500 tokens. So that's a pretty good ROI. Soon you can also stake tokens, so that 50 tokens to post is not an issue. But it disincentivise spammers from spamming.
Plus..the reviewing/editorial system is not finished yet. It is going to become much more intricate.
I see you are pro eos :) internet is also a big spam pond but we have tools to easily find content that we are interested in. We need the same for STEEM :)