The auction house is an opt-in PVP enabled zone imo, plus as a sniper myself I can tell you if you're taking the time to memorize or click on the name of the seller who fucked up, someone else will often snipe first. And they'll likely have less qualms about their purchase than you. If you care that much check the forums for a sympathy post by the seller, there are some threads specifically about misprices as well. For something worth as little as the NOTN genes though, I really wouldn't bother.

Make that schmoney, honey.