It is very hard to make a perfect system where only best contents will be rewarded. STEEM blockchain reward the contributions not only the content: investing through DPoS and selfvoting to some extent, contribution to the blockchain developments (e.g. all the DApps developments), all businesses on STEEM blockchain (e.g. bidbots, its interesting to see your post is trending due to bidbots!) etc. Steemit is still in beta and experimental. At least it is working in some ways and shows the concept is working. Though its creates lots of junks but there are lots of jewels too. Google searches on some topic bring people to Steemit. For example, "What is EOS" return the fifth ranked article from Steemit. For more: https://steemit.com/life/@whatsup/steemit-isn-t-fair