To be honest, I don't think so. o_O; I'm not 100% sure on "official rules" but from what I know, private photographers can do as they please when arranging shoots with people, for profit or not. The only thing I know for sure is that private photoshoots can't block up areas with high congestion (the entrance into the Hynes near Au Bon Pain for example, though I am not sure why one would want to have a shoot there. xD)
You actually would not even need to buy a badge if you want to do the photoshoot outside of the Hynes convention area itself.
Sync the Tempest (Tales of the Abyss) at Anime Boston 2010, AAC 2010, and AB 2011
Kratos Aurion, Judgment(Tales of Symphonia) at Anime Boston 2011, AAC 2011, and AB 2012
Jack Vessalius(Pandora Hearts) at Anime Boston 2012, 2013
Roy Mustang, formal (Fullmetal Alchemist) for Otakon 2012, Anime Boston 2013