Just general speculation, but it seems to me that the schools where recs are more a necessity than a frill are perceived as "more competitive." At these schools, recs increase a PNMs opportunities for party invitations (and the lack thereof will probably limit opportunity). I'm sure the laborious process of securing these probably makes it
feel very competitive.
Many of these same schools also have high numbers of well-prepared PNMs and abundant legacies, along with home-state/hometown stronghold chapters. As mentioned earlier in the thread, PNMs who have their hearts set on a few chapters that fall into this category will most certainly encounter competition -- these chapters cannot pledge every sharp PNM from a particular high school or city.
For those recruitments using RFM, the likelihood of a PNM finding a Greek home is very high, regardless of the number of chapters and PNMs. Speaking for my alma mater anyway -- the number of PNMs released from recruitment is not as high as most people might imagine:
http://greekaffairs.ua.edu/documents...r2002-2012.pdf