I agree, the promotion by many users who can economically do it, allows their posts to be more viewed, can have greater access to the steemit community in general.
This is how big accounts benefit much more than those who do not.
It is also true that these promoted publications are not always quality, in fact, many do not even use any type of edition, and it is absurd that they get thousands of followers and even hundreds of votes.Beyond what you mention friend @alexanderrigov
Another thing to consider is that many manage to make good investments in steem power, and this allows them to negotiate with some whales, exchange votes.
I have noticed that many publications of some users have almost the same number of votes each time they publish, and in the same way they are practically the same as those who vote in all their posts.
We know that you can automate the votes, and in this way "help" to obtain constant income.
It is a game in which you fall on that platform, where quality does not always prevail in the content, but the strategies you use.
It's part of what I've seen, to add to your point of view.