I'm an FSU alum so I know all about PBM. I like what PBM stands for, however I think that it's too greek like now. I've seen some of them with line-style jackets. Also, I've seen a lot of guys who are now greek come through PBM first. I wouldn't say that PBM was a feeder for D9 orgs but it's not a conincidence. Youcan also check out their sisters at
http://www.sistuhs.org.