What about just posting the map as private? That way the rest of the thread is open for reading, but the map artwork remains among the players of the module.
By the way, I am extremely pleased with Paizo's community user policy the availability of pdfs of rule books and the PRD: all of which make me more than happy to contribute financially by subscribing and buying Paizo products. These are the main contributing factors leading me to switching over to Pathfinder (not to mention the artwork and the well thought out rules).