Chinese have been outsniping my ranker items for more than two months now. I sometimes get lucky, though. My guess is that they operate globally, having offices with hundreds of computers near diablo servers worldwide. Trust me it is a huge market (more than 10 grant a day all servers combined). I can tell you this because before the Chinese came along, I used to earn more than 3 grant a day in Asia server only. If they are sure they can outsnipe any other bot (including HA), they sure have resources and will to invest so.
I heard they have more than a thousand computers in their headquarter in China which they used to run for auto farming. Now they use them for AH sniping and bidding of 2 bil+ items. From my experience, I can tell you that their program or macro is not that efficient, meaning that one bot/computer covers only one legendary or only one criteria of rare items. But they are extremely fast.
From time to time, you would observe zero gold bug (items that are worth more than 2 bil gold bid at zero gold and no one can bid further) on auction house. This bug happens when two or more bots/macroes/realfasthandsnipes bid at the same time the item becomes available on AH.
Thank you ChuiChu for working hard on the new and faster HA. I wish the new HA would allow me to outsnipe the Chinese again and take back the glory days
