Personally I don't find anything wrong with these services.
You have to remember that it is me paying for these services and by doing so I not only make a bit more steem but I also make more for the curators of my posts.I have used services like @buildawhale @minnowbooster @boomerang and @bellyrub.
What does bug me is the fact that there are some people that leave a comment on a post asking you to send them money and they will upvote you but never upvote the post.
Or the fact that my wallet is full of people that want me to send them money to upvote or resteem my post but do nothing to increase my steem power. They are the true scammers!
Thanks for the article and the discussion.
...upvoted and resteemed, my friend!