Really? I thought the folks in WFP07 were almost universally pretty good looking, healthy, skinny folks. Some were better looking and skinnier than others (Heysan, for example). And the software dev shop I worked for in Austin, Texas was chock full of good looking dudes with good looking wives/girlfriends (and it had double nerd power--they developed scientific computing applications and had geologists and mathematicians who were also software developers).
Perhaps you haven't looked at the average American lately...
A quick flickr search for "ycombinator" suggests the opposite...