Ehhh I don't see myself doing too much with this auction house. My professions are JC/Eng so those two alone getting all kinds of gold sinks (all of those panther mounts and that Blingtron bot, I only assume he'll be expensive to make), but I usually don't go anywhere near an AH. I just level my professions with mats my boyfriend's paladin mines; I let him do all the selling since he seems to have a better grasp of it. I still have 100K to my name (and I've spent maybe that much in my game's career) probably just from doing dailies back in BC/Wrath. There weren't that many to do in Cataclysm. I always feel like that's a lot of money, especially since it seems only my immediate friends also have that much. But then I'll look on a forum and I'm the only one opposed to a 250K goldsink mount, and so then I despair a little.
I'm a very stingy person in all aspects of life.

I hoard all my things like no one's business. And I collect for the sake of collecting. Unless they plan on putting, like, 50-slot bags on there so I can then hold more stuff...
I think my only goal right now is to manage to get the gold sink stuff specific to my own professions. Considering I have yet to buy a Vial of the Sands
(and thanks to Blizzard's really smart decision to not make the recipe ACCOUNT-BOUND I probably will never get the recipe for my alchemist to make it anyway, grumble grumble) that's pretty much the pattern I've been following, anyway. I made a chopper in Wrath, and I also bought the expensive Mammoth then too, so I know I can handle it this expansion. Maybe.
<rant>
Hopefully I get that kind of drive to do lots of dailies again. I really don't feel like learning how to "play" the AH on my low population server just to make some cash. I used to try to sell gems, but I learned that it somehow was more profitable (by which I mean "woo I made 200 gold") to just sell the uncut ones to one specific guy who would then cut and resell them. It was a waste of my profession if I wasn't even cutting them. I still just have no motivation to ever sell anything. It's kind of ironic, because the character of Neilaren is actually supposed to be extremely businessman-like. In-game I just prefer to do things for my guildmates, because my server really sucks.
There are a really small subset of people who I don't feel deserve to spend their gold on dumb rare un-acquirable things, and I just KNOW they will do so, but it's like, one or two people on my server, so I'm prepared to see them do nothing but idle in Orgrimmar thinking that they're hot sh[rest omitted].
It'd make my day if the rare black market stuff sold to someone else. I'm that petty. I don't plan on trying to get that stuff myself, so it's not really jealousy because I have plenty of my own mounts and gearsets.
It's just FGSFDS STOP TRYING TO SHOW YOUR STUPID MOUNT OFF TO ME I REALLY DON'T CARE. LOOK AT THIS ICEBOUND FROSTBROOD VANQUISHER I GOT BACK IN WRATH THAT IS HOW MUCH I CARE.
...Ok I feel better now.
I have a feeling it's gonna all go to the one guy Alliance-side who seems to camp for Poseidus every week and that's why I have yet to even see that mount on Horde AH because people are allowed to just camp it over and over and over have I mentioned that my server sucks?</rant>
I think the Black Market should have joke items on there too... like Bloodthistle. "Hey man, where'd you get that bloodthistle? I need some badly..." "On the black market, man..." (Does Bloodthistle even still exist?)