But shouldn't the solution (formula) be "simply elegant"? eBay seems to be on to something with: positive/positive + negative rating system. The user knows how

But shouldn't the solution (formula) be "simply elegant"? eBay seems to be on to something with: positive/positive + negative rating system. The user knows how many data point are in the pool which over comes the one positive rating gets five stars. Much in the same way http://demanddriventech.com/home/solutions/replenishment/ http://demanddriventech.com/home/solutions/replenishment/ has come up with a "simply elegant" formula for supply chains that is human understandable and effectively solves the problem.