Well i found this by acsident...
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Nr. 1
I bot Nightmare for gold farming in core and what i found you can sell for good price yelow drops in AH..
Rings/necks/all higher base statt items sell 100k-500k (lvl 40-45) Legendaries too. (basicaly its buff my GPH about 500k an hour)-so i get 900k/hour
all you need is set bot pick (rare LVL 8 legendaries) in that set rares 80% will have good stats which will sell easy Not like 60-63 lvl stuff.
Dissatvange in this setup you must clear your inventory each 1-2 hour .. if you go for long time away so yes just pick legendary items...but funny part legendary sell for lower
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Guide Nr. 2
THis guide can make you tons of gold.
1.You must be capable of cleaning Inferno act 3.
2. Go to blizard forums make a post ( Cleaning A3 inferno place bids to join)
3. Profit - this one works i do my self. (bids usualy 1.5-4 mills) x3 4.5-12 mill per run - +-40 min,
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Hope it was usefull.