It seems like a lot of this thread doesn't have a firm grasp of the recruiting situation in the Ivy League. I'd break it down by list here:
1) Generally, you're limited to people who got a 1300+ SAT (not sure what the equivalent is now with the Writing in there). This cuts the field of runners enormously, especially since the rest of the Ivy League/Stanford etc. is going for exactly the same kids.
2) No athletic scholarships, so anyone who has a 1300+ SAT and is that fast is probably getting a very nice offer from their state school
3) No merit based scholarships, so if they're that smart they're getting offered more money by their state school.
4) The Ivy League dedicates far less money to their athletic programs than larger name schools, which often means they can't have as many people on the team and their facilities are worse. Have you ever seen U-Texas' track?
Ivy schools are mostly recruiting off reputation, which is strong, but their pool of applicants is limited. If a National level squad starts with talent, then the teams are limited.
Also, try making it to NCAAs out of the Northeast. It remains the toughest because Iona/Providence are nationally ranked and there's a lack of great meets in the Northeast to score points. Basically everything rides on the one trip to Pre-Nats that the athletic department will spring for.
Recruits for Ivy schools are kind of a zero-sum game and Princeton is doing a very good job corralling the market.