I'd say for all of my frat brothers from college, maybe 30% or less of them are still active, attending functions, doing community service...etc. My chapter was 30 bros strong on campus, and I can think of maybe 5 or 6 that are still active.

The brothers out there doing the actual work are mostly bros that pledged grad chapter. Their motivations seem a bit more sincere. Even if they did do it for the networking opportunities or the social status, at least they are doing the actual good works of the frat.

More often than not, college bros pledge, enjoy the social status that comes with it, do the service part, but let it go once they leave college. Then it becomes nothing more than some paraphernalia, and the occasional convention.