Originally Answered: Have you ever noticed this pattern about popularity?
In many ways, I believe the "cool kids' " popularity becomes a complex for them later in life. From my observations, it appears that individuals who have already been confirmed, and even celebrated, while in high school do not feel the same motivation to further themselves and achieve more. While this absolutely is not always the case, you can see this in renditions of high school quarterbacks reminiscing on their high school days as the "best days of their lives." In many ways, because people who struggle socially in high school have reasons to both support and deny as high school years as pleasant, and for this reason, likely feel the need to gain more from the present moment.
As with anything, there are many explanations and exceptions to your observation. There is also the argument that students who are not popular in high school lack popularity because they are more focused on their studies. As studious people grow up and move into college, they are placed in an environment where a greater percentage of their peers share similar values to them. Likewise, because they spent more time studying in school, they have conditioned themselves better for the real world, giving them (in theory) better chances at getting their dream job, hence, working with a group of people who share common interests and passions, allowing for larger and stronger groups of friends.
On a general scale, however, I am prone to agree with you. After all, I think there is merit to Bill Gates' sentiment about treating nerds with respect, because one day you will work for them.