I will reply to this later this evening when I have time.
However, my initial reaction is that it is all relative.
For instance, (and this is completely random figures), say someone has 1000 roids and look for targets that ahve 500 roids. (50% is easy for me to calc).
If everyone has more roids, then the total you have goes up. Say 1200. Thus you are looking at getting targest with 600 roids. THis means you are still hitting the same targets.
With the percentages staying the same.
I may of completely missed the point though, I am certainly in a rush