Kozmik, you’ve quoted your “Greek facts” from the website of the Panhellenic Council, which provides no primary citations of sources whatsoever. The page to which you link says “Statistics taken from the University of Nebraska Greek Affairs Website”. I didn’t see any primary sources there either.
Similar statistics are proclaimed by many other pro-fraternity websites (Google “50 largest US Corporations” for several of them), with only the very occasional vague reference as to the source of the statistics (e.g. “Two-thirds of the nation’s most influential business and political leaders are Greek (Source: Fortune Magazine)”, from here.)
The OP is clearly aware of some of these claims, but is asking for the Straight Dope. Quoting the same old fraternity sites isn’t going to cut it in the General Questions forum.
Some of the statistics have mutated during their passage from one website to another. I can believe that the number of “Greek” CEOs of the 50 largest US corporations can vary from 40 to 43, but I’d still like to see an independent cite for either number.
What I find really hard to reconcile, however, is your linked “76% of all Congressmen and Senators belong to a fraternity” and another fraternity site’s (more believable, IMHO) “52% of the U.S. Senate and 33% of the House are members of Greek organizations”.
( let’s not even get into whether an academic group touting its own merits should be talking about “Congressmen and Senators”.)
I’d love to see some sources for some of the “Greek facts” you quote. Perhaps, as you say, statistics “don’t lie”, but they can certainly be “made up”. Just sayin’.
Also, you say:
Any Presidential alma mater has “graduated a disproportionate number of Presidents”, given that there have only been 43 POTUS and there are thousands of institutes of higher education in the US. Also, looking at famous Skull and Bones members, I count Taft and the two Bushes as having made POTUS; noteworthy, perhaps, but three isn’t “many”. Are there others that I’ve missed?
Am I correct in guessing that perhaps you’re a member of a fraternity yourself?