You are right about the value in promotional services. It is misusing the reward pool mechanism for that purpose which is the real problem.

We have the promotion tab, but the problem is that no one looks at it. Maybe it would be a good idea for more of the user base to try to encourage Steemit to start showing some of the promoted posts on more visible pages such as Trending, feed, etc. I know this suggestion has been made before but it has fallen on deaf ears.