Just my observation..................

...........................................but systems frequently get gamed.   Something about human nature.  Always remember - the one unbreakable law is the law of unintended consequences.  Ben Carlson is on the case.  A wee excerpt here:

Incentives drive the world in many ways so getting the right compensation system in place can have a huge impact on people’s actions. Measurement can help an organization better achieve its goals but it can also lead to unintended consequences. Performance bonuses or fees are typically seen as aligning interests of all parties involved but there are downsides when the wrong measures are used.