I'm in the pet trade. I switch pets over the Neutral AH using a friend (usually my husband or brother) once every few months. I mailed my brother a huge mountain of horde pets. His bags filled with Prairie Dogs, he listed 5 at a time for me to pick up using good old-fashioned search spam.
By his second listing, I'd already told him "Stop."
"We have an AH bot. I bought the first Prairie Dog and the rest were just gone. Poof. Way too fast for a person."
"On it. Then I'm switching to Birdfall and killing him. A lot."
I finished my report, switched to my alliance mage for easy teleports instead of Birdy, and flew her down to Booty Bay.
I looked around for the wee scoundrel but didn't find him. I switched to my horde bank and checked the zone. No sign.
Disappointed, I figured he'd logged.
I switched back to my Neutral AH character to get his name and look for him one last time, but then I noticed that I had a reply to my ticket.
"Thanks for your ticket, we're looking into it" said the automated GM response.
I tilted my head to one side and then the other.
I put two and two together.
I felt much, much better about losing 11 Prairie Dogs.
Burn, you jerk! Burn under the mighty banhammer of justice! Flail and weep and gnash your teeth! The Neutral AH traders of Zuluhed rejoice on this fine free-commerce day!