Looking back through my archives, there's a post I made on March 25th with a little prediction of the next big gold sink in the game.
At the time, I was comparing the costs of the Epic Land travel which was the gold sink of Classic WoW with the cost of the Epic Flying travel which was the gold sink of Burning Crusade.
Not including any faction discounts or whatever, we're looking at basically a 500% increase in cost.
So the swami predicted that the gold sink in LK would be another 500% increase over that, which would put it at roughly 25k gold.
Currently, with no faction discounts in place, the Mammoth mount is expected to cost 20k gold.
Will that price hold steady and prove me wrong, or will Blizzard alter the price and keep a linear progression in economic inflation from expansion pack to expansion pack?