People rate their own posts to start because they know they won't get a fair rating from any of the clowns that post here. It's all about the personalities on here rather than the content of the post. You could write the most compelling summary out here backed up with facts and evidence but if it isn't in favor of the stock you'll get 1's and 2's.
Tell people you just bought in or more and that's it's going to see higher prices and you'll get 4's and 5's. And that's without any substance whatsoever to back it up.
In short, the ratings system here is a joke and open to abuse.