Heh. Well Skull and Bones was technically a college fraternity as well. A lot of the college fraternities are sort of "testing grounds" or "breeding grounds" to select people for positions in higher groups.
Though.. Some college fraternities are just basically jokes as well or secret for other reasons that aren't necessarily political, so I dunno if the one your in is one that is grooming kids for bigger positions, or.. Just one of the more joke/regular people kinds.
It really is just a regular greek social fraternity. So the nature and its origins was a secret organization in the 1800s. Now its little more than a group of guys with common interests/values that like to have fun together/party. Yes there are a lot of deep secrets within the organization history but that is not a priority for members minds. At least in my chapter.