I will start sharing what I'm actually doing now to earn some gold.
Those are prices per single item, listed and with -5% AH cut.
Infinite Dust - 4.05g / 3,84g 75s
Dream Shard - 13g / 12,35g
Greater Cosmic Essence - 11g / 10,45g
Eternal Earthsiege Diamond - 39g / 37,05g
Heartseeker Scope - 59g / 56,05g
Dark Jade - 2.10g / 1,99g 99s
Shadow Crystal - 99s /94s 05c
I'm actually sitting on 4300g cash of pure AH farming, plus some couple of hundreds gold in bags and raw mats.