It seems that Blizz finally found a way to get rid of botters. Instead of hitting their account with ban waves they've hit their vallets (PP accounts). They've just removed the profit incentive.
I was expecting this actually - in August they've already done this, lowering a minimum price for gold from 2.5 to 0.25 for 1 mil. Nobody was buying at RMAH for 2.5 because 3rd party was offering 0.6-0.75. The same thing just have happened now.
I just didn't expected that the lowest margin will be so low. 0.02 per mil is quite miniscule, even for Chinese it must be low.
Not sure if the new gold sinks will be able to rise the prices to previous minimum...