After 7 days, that's all. No more profit can be gained from the post.
It is meant to encourage people to keep adding new relevant content, and keep making more posts.
The good thing is that your posts will forever stay on the blockchain, for free! I keep a lot of historical photos here, so I can find them again when I need them. Can't beat that.
RE: Can you generate steem/steempower/steemdollars?