A lot of times gold bloggers like to refer to gold making as "Auction House PvP", but in this case, it's literal. From this article on PvP in Mists on battle.net:
"It’s also worth noting that the Black Market Auction House has the potential to become a world PvP location for those on PvP realms. Just like the name implies, these are goods being sold out in shady locations away from the prying eyes of guards in the cities. They are not in neutral or safe zones. For PvE realms, it’s not going to have that same risk for placing a bid as on a PvP realm (aside from being outbid)."
So if you're on a PvP realm, there can (and probably will) be a great amount of PvP going on at the Black Market AH. Not only do you need to make sure you bid at the right time and price, you have to make sure you're alive to make the bid! For me this is okay, as I am already into PvP (as well as PvE) on my posting toon, an 85 Frost Mage, but if a guild on the opposite faction decides that they want their friend to have a certain mount, who are you to speak against that?
Now I'd imagine that stealthies may be having a great time with this one, when an Alli thinks he's in the clear and about to win an epic mount, unstealth put in a last second bid and come out on top. Or maybe your toon will decide cast out your fear bomb seconds before the auction ends, ensuring their bid is the winning one. The possibilites for entertainment here are endless, and it should add to the overall competitiveness of this market. For all those who are speaking out against it, even if you don't have the gold, you still have a way of "getting back" at those who do. Which brings me to my final question:
How are you going to interact with the Black Market Auction House?
If you like my blog follow me on twitter, @PhatLewtsGold!!