I'm a long-time mogger, and I've been in business since early-Cataclysm. I worked very hard to compile shopping lists and create post profiles for literally every rare and/or unique item in the game. Which means, of course, that I typically have over 1000 auctions posted at a time. Juggling these is a lot of work, because I cancel around 100-300+ per scan for repost.
My issue in the past, was that the consumer base on my realm is pretty cheap... most people a year ago weren't willing to spend 500g on a low end item, let alone 20k. Despite that, I was the only prominent mogger on the realm at the time, so I threw my gold around. I bought up every cheap green to force my prices. This worked amazingly well, until MoP hit.
With the massive influx of people leveling pandas, the AH is flooded with that used to be rare greens. On top of this, I am now competing against 5 other people who post about 1/3rd of the same items I have at extremely deep undercuts. I'm honestly not quite sure what to do about the situation. If you look up certain greens, the postings often appear like this: 1500g, 1500g, 999g, 800g, 200g, 199g, 80g. So not only am I sitting on a ton of stock that will never sell, but if I lower my thresholds I'm risking some guy buying it all cheap and posting at my original price (which actually has happened, I had three of my competitors attempt this).
I'm an incredibly stubborn person but I'm considering throwing in the towel and going back to one of my professions. I love the profits I get off mogging... when my competition slacks. Otherwise I'm lucky if I pull in more then 3k most days.
So, auction house gods, what would you recommend I do? Continue as normal, wasting time and energy when most of my stock is so undercut it'll never sell? Lower my thresholds and make a tiny fraction of potential profits? Bail altogether?...