It's even sillier than that. The performance gap between the best and worst is a factor of hundreds or even millions and the best performers are very rare and e

It's even sillier than that. The performance gap between the best and worst is a factor of hundreds or even millions and the best performers are very rare and expensive. Worrying about a 15% performance loss is like finding a $100 bill and complaining that there was not a penny too. In reality, these social analysis companies will be data mining to find people far to the right on the performance bell curve. They might try to weed out the particularly crazy, but the ones you most want to weed out are masters of deception.