I think it is well documented that people on this board take mileage runs or trips solely to earn miles. And mileage runners tend to try to fly during bonus offer periods. Perhaps a more interesting question, and maybe what you were trying to get or hint at, is the question:
What percentage of your annual trips are solely mileage runs?

Someone who is just shy of status who say flys for business and just needs 1-2 trips to get to the next status or bonus is one type of mileage runner. But then there are people who largely earn 1K on a significant portion of mileage runs. Perhaps most people are in the middle. But yes I guess the question would be are there people for whom the majority of their travel is mileage runs and what makes one do this?