I'm having almost no problem selling through my auctions so I don't know what people are doing to get such poor results. This morning I logged in and 7 out of the 10 I had up last night were sold for appx 1.2 million income.
I don't deal in super high end items (anything more than 1 mill), except sparingly. High end when I list take more than a few listings to locate a buyer and if the item exceeds the 3-5 million threshold I send it over to the RMAH.
I sell mostly clvl 50 through 60 items. The average price of one of my auctions is between 50 and 100k, I always try to list at least one 250-750k item per day.
My auctions always have a Buyout on them that I actually take 1-2 minutes to look up. My bid price is generally 50% of the buyout.
I have a stockpile of goodies to sell (3 mules including 2 tabs of the stash) which are all pieces my five 60s cannot use or would treat as a downgrade (I tend to alternate the majority of my sets between wiz/wd and monk/dh). All pieces contain stat/vita/interesting stat. Interesting stat being All Res, Crit Chance, Crit Damage, IAS, High Magic Find, Radius, etc. or a combination of them.
Things don't always sell immediately, but when they do it's nice.
I can somewhat agree with the gold being difficult for some so they don't get a lot to spend, because I know the majority of players aren't as good at the game so they get high end repair bills. I primarily play Monk now and farm Act 1 Warden/Butcher and Act 3 Siege with a balanced spec. Repair costs aren't a problem because I don't throw myself at combos that are greater than my character and I know which ones will be a problem. My Act 1 runs net about 200-300k per hour and Act 3 I just run for high odds of 63s so I know people like me have gold for the occasional upgrade.
Now if you are a person trying to sell something that I would normally sell for 100k for 100m-2 billion, then yes you will get the item back. Most people aren't as good at auctioning as they thought they were because the market was a laydown in the beginning and everyone needed gear. I sold for years on Ebay so I am very adept at putting together quality auctions in tough markets. If you think this is hard, you've not seen anything yet.