You know how hipsters really like the indie band that nobody's ever heard of? Good or not, an unknown band will beat out a famous artist any day. Then they complain when that band gets famous or "sells out" by having songs featured on TV shows or movies or whatever. At least they can still say, "I knew them before..."
Part of me feels that way with you guys (anyone reading this). I get a lot out of discussing teaching, math, and everything else through blog comments and twitter and everything else. I get why I should share my experiences here with my companion teachers (although I don't think many of them would actually do it), but then the hipster in me comes out and I don't want to give up my trade-secrets!
Maybe one day I'll get around to giving a professional-development talk to the teachers in my area about the usefulness of a PLN and the online component of that, but in the meantime, I'm enjoying the spoils for myself!