Anonymous wrote:... must pay for friends ...
I don't think you understand how the dues system works. Yes, each person in the fraternity pays some amount each semester. (I'm writing about fraternities because I was in one, but I assume the system is the same for sororities.) The amount of money is based on a proposed budget presented by the elected treasurer at an all-members meeting, where the treasurer will describe all the costs the fraternity expects to see in the coming semester: for example, cost of beer for parties, cost of caterer for people choosing to eat at the fraternity house, cost of maintenance and upkeep on the house itself, cost of insurance, cost of a new pool table or new furniture occasionally, etc. If memory serves, the biggest costs were the parties. So when an individual pays dues, he's not "paying for friends" as you cleverly put it, he's paying for his share of the cost of throwing several parties and for a place he can have fun. Quite frankly, the budget process is less "Animal House" and more "Chess Club."
I was pretty broke in college, so I actually calculated the cost of dues + rent at my residential fraternity, and figured out it was less than what I'd have paid for a dorm room at my college. So in my personal case, it was actually cheaper to participate in a fraternity than to live in the dorms ... and I also attended lots of parties and developed a pretty good combo shot on the pool table!