"At the rate a pro snaps a board it wouldnt be cost effective to use epoxy."
Epoxy resin (top notch Greg Loehr type stuff) bought in quantity is about $50 / gallon vs. $30 / gallon for poly resin. Easy to glass two boards per gallon. So thats $10 / board more using epoxy resin. I realize the pros go through a ton of boards but its still hard for me to believe $10 / board is much of a factor.
I would have guessed the sweet feel of a poly blank, quicker to shape and glass using poly resin, and the corky feel of EPS foam would be the reasons pros are so hung up on poly..not cost.