Note: it's quite hard to understand, even to myself. I'm trying to write as best as I can while English is not my native language.
Today when I'm looking at some Radiant Star Gem and I notice that the price fluctuates a lot for those Ruby (The actual last 10 transactions price, it kept going up and down at each refresh)
So I go ahead and buy one when I see the last 10 transaction price is so low. Because why not? They were around 14-16m for the last 2 days.
First try: (when last 10 transaction was 7m), I bought it at 18m.
Second try: (when last 10 transaction was 10m, then went down to 8m in 1 refresh), I bought it at 266 gold - WTF [1] . It's clearly not someone's mistake, I believe they do it intentionally.
Third try: Bought 1 at 18m gold. And I stopped from there since I saw "last 10 transactions" price keep going up.
So I guess someone is stocking up a lot of Radiant Star Ruby, sell some for ridiculous low price (maybe at the same time trying to buy them back as fast as possible?) so that the "last 10 transaction" value lower. Make people actually tempting to buy at the high price that they want to unload.
Another theory is that: when I try to put the gem for sale, the price is automatically set at somewhat 10m. Many people won't notice it and just sell it at the price that's automatically set. Then the gem market manipulator can stock more gems at low price.
Proof:
http://i.imgur.com/dqN5p.png [2]
http://i.imgur.com/2yXbl.png [3]
(I actually bought a Radiant Star Amethyst for use at 6.9m before buying those ruby. They went back to 10+m now. I guess it's someone who just put it up for sale at AH's automatically suggested price that's based on the last 10 transactions)
And they went back to the normal 16m-ish now, after someone has finished unloading their gems...:
http://i.imgur.com/eVffu.png [4]
...
mua mẹ 150INT 70 AR khéo 20$ 30$ chưa tới, thêm cái vit làm gì trong khi AR thì thấp 
