Since it's user-based, you have to take everything with a grain of salt. Some people may make fake names to sort of 'test' the system. i.e. create hypothetical numbers to see where they would fit if they attained those numbers. Or people may just lie, not that there is a logical reason to falsify your own numbers. I think its a good tool in general though. If people are honest, it can provide a real sense of what is happening in the big picture.