Good point,
But when a Massive Bush fire breaks out the states governer just wants to put the fire out as quickly as possible, to avoid any political fallout, so they hire as many FireHawks from different states to quell it ASAP.
I know some Firehawks that travel halfway across the U.S each week to differnet fires, during the season, I don't think a company could justify haveing 20 pilots off season.
Maybe I am wrong and far from an expert.