You make a valid point but I disagree regarding the rewards system encouraging people to NOT post controversial content.

People will eventually be fed up with the same "Hi, I'm a girl I like traveling and by the way, here's some bikini photos", "I made this website with beautiful graphs", "This is another average sob story" or "How to make money on steemit" posts. I, for one, already am.

Once this becomes a more widespread opinion it will not go unnoticed because suddenly such posts won't rack in $1k-$10k. I'm sure that will bring quite the revelation to the steemers, and hopefully help them realize that generic content is nothing special.