It's not a democracy - Yelp pushes the best reviews to the top. Most people read a couple of reviews, it serves Yelp's interest to make sure they read the best ones.
So, in other words, I as the user contributing reviews for which makes Yelp valuable, are treated as a de facto ruffian, my time and effort expended to "share" considered folly. So Yelp "filters" these and beyond wasting my time (as I should just collect in my own file of reviews or "share" on my own site) is it not a great conflict of interest going on here?