On a separate note, last my school's Panhellenic decided to have free upperclassmen (usually sophomores) up to 5% of quota (which worked out to 2 people). It was very evident that every sorority selected 2 people that were sophomores that they wanted. There was also a problem with women leaving recruitment when they didn't get the sorority they wanted and saying--"Oh, it'll be OK, because next year I'll be free and they'll take me!"
They removed the rule this year due to those factors, but now there are a lot of sophomores who dropped last year going through. It'll be interesting to see how it all works out.