The goal of the community manager is to continually progress the community through the community lifecycle.
By progressing the community through the lifecycle you maximise the potential of the community.
If you have a community that's just launched, you don't do mass promotion. You work to sustain a high level of activity from a relatively small number of members.
If you have a community that's highly active, you would focus upon introducing sense of community elements.
If you're not actively working to progress your community through the lifecycle, what exactly are you doing?