It does nothing to stabilize prices when you have to wait a week to see if the item you're looking for is put up. It does nothing to stabilize prices to see that item you have been waiting for a week or two be put up for an extraordinary amount of DFO Gold , forcing you to either make the choice of buying it or waiting another week for the chance that someone will put it up for a lower amount.
There are many factors that go into the increase of price of a product, do not think that you know for sure it is one single thing. I even mentioned this in my post. The RMTers have not lost anything, they have tripled their profits. Now, as you said, because all cheap DFO Gold transactions happen in 2 days, Neople now has a harder time tracking down the RMTers as thousands of transactions happen in the span of two days. This should have drove down the price of gold, because the botters are not being stopped, they are still making billions upon billions of gold a day. There's a reason why they say it's instant delivery, that's because they have a huge surplus. When you start seeing them say 'delivery in 10-15 minutes, 24 hours etc" that is when you know their supply is dwindling and the actions taken against them are working. Limiting the AH does nothing at all.
Neople does not have the health of the game in mind, they are a company seeking profit. If they see more red than green, they will pull the game. The fact that we are seeing a trickle of content instead of all the content being released is proof of this. They are milking the community, trying to keep players playing for longer, which increases their chance to stay with the game and buy items with Cera.