I graduated from D1 good academic school in northeast and I regret my decisions not to go out for the team in college 25 years ago and join a fraternity instead. I think about it very often to this day actually.
Yes there were some benefits to Greek life and I am generally pro-Greek for those who want this, but it does not fit well with an athletic lifestyle in my opinion. And I am not sure how one could do both - gaining significant weight and being drunk most of the time is not very conducive to being able to run competitive times...