putting Ashes on AH would just force many into buying gold (as it will go for absurd amounts of money 500k +). In the end it would result in more bans :s
They don't ban people who purchase gold. (I wish they did)
.... think a bit
The first few monthes are surely nearly unpayable,but after them the prices will break and you`ll get them fore a few gold each item (10-50k).Therefore in MOP the gold will rise hardly again,so NP for 60s twinks in the future to buy the whole t3.
Rogue talk on.
You don't need the whole t3. I mean except if you really wanna get full transmogrification. Let me rephrase,
I don't need the whole T3. I will only go for BBLP.
Bracers, Breastplace, Legplates, Pauldrons. These 4 pieces make you BiS, the rest is garbage. BC rings, waist, boots, helmet are still bis over T3. And the T2 with 60% disarm is still very good vs T3. The T3 gloves are bis only dps wize, and yet it has 10% hit that goes to waste because with BBLP you are alrdy capped hit (for pvp).
So really I only need 4 pieces. And that is
if the black market sell all 9, there is no data to sustain that currently, I've only seen the rogue T3 helm so far ?
Now concerning prices, I think it's going to be about what you said between around 30-50k, except maybe at launch, not even sure. People will want to keep their gold for ashes of alar, and/or any subsequent mount their could be. Also the T3 rogue set isn't that good looking that would justify hundreds of thousands golds into it.
Now if you are on one hell of a big server this might become a severe problem.
Also note that most "rich" people intend to stay that way, it's unlikely they will want to spend lots of gold into transmogrification. I would be surprised to see any piece go over 100k. And gold isn't that hard to make. You still have several months to be all over that.
Lastly T3 BBLP will only net you an extra 3% crit + the bonuses. I don't have the chardev, but I've looked. That's cool, but not game breaking either.
Anyway, anyone buying the other 5 pieces first, would be doing a monumental error in my opinion.
Rogue talk off.
Overall this is a good news, people who fought tooth and nail to stay level 60 (instead of going 64), will be looking a lot cooler with T3 gear as 60 than 64. Not that I ever promote the cool factor. But I mean a level 60 holding several hundred thousands golds worth of equipment on his shoulders, that's gotta be high on the cool meter, I gotta give you that...