Do that with upvotes and lack of downvotes. Start upvoting based on actual value to Steem (external exposure is one great example but not the only one) and not just content that looks pretty but does little to nothing to help us (we could use 'likes' or some such to express recognition apart from pay) and downvote where value to Steem is absent but people upvoted it anyway.

In a few cases it might happen too late (after 7 days), in which case I would agree with the SPS idea of an exposure bonus fund or such.