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What if we add another level to the idea of ascribing value to the contributions of a community member? Let's say we are a bookseller. People who write reviews are valuable to our business, not because they buy books in large quantities (in fact, we might even send them books to review), but because their reviews help sell books to people who will appreciate them. Even by steering some people away from a book, the reviewer can help the bookseller build long-term relationships with book buyers. It's pretty easy to see who we might ascribe a value to the reviewer -- sales of books after viewing a particular review (or, better, after marking it "helpful" and then going on to purchase the book).
So where's the value to the reviewer? Part might be that the seller puts high-value reviewers at the top of promotional book give-aways. So reviewers get more books. Reviewers might even be allowed a small percentage of the sales of books they review. And, of course, there is notoriety in being a highly ranked reviewer.
Is there value for the community at large, particularly, those community members who might not receive a high valuation in this scheme. Perhaps so. After all, they want to spend their money wisely and so are likely to also find the high-value reviewers helpful, useful, valuable.
Granted, I cherry-picked a fairly easy business and model for my example, but I challenge my fellow community managers and facilitator. What other kinds of positive feedback loops can we create that build value for different aspects of our communities such that even if the value were quantified as a number, people would still be willing to contribute?