Lets check all your gear on the auction house, and see what its total worth is. Shall we.
Inna's Radiance - around 2 mill.
Vile Ward - Around 20 mill.
Neck - Around 50 mill.
Gloves - Arond 50 mill.
Inna's Chest - Around 40 mill.
Lacuni - Around 50 mill.
Witching Hour - Around 24 mill,
Inna's Leggings - Around 20 mill.
Ring 1 - Around 6 mill.
Ring 2 - Around 50 mill.
Boots - Around 25 mill,
Weapon 1 - Around 100 mill.
Weapon 2 - Around 50 mill.
This Totals up at 487 Million. Then you safe the 15% fee. But you also need to be cheaper than AH for people to want to buy it from you. So lets say you and the buyer shares the 15% fee. Meaning you get 7.5% each.
So we take the 487 Mill and minus the 7,5% - That gives you today a total on 450.5 Million gold for your total gear.
Then we can add another 50m for sake of double resist on some of the items.
As we said earlier.. If you get 500m consider yourself lucky.
Not that I disagree that 1b is way too much, but 20m for those pants is nowhere near AH price, the cheapest similar ones are at 40m atm.
Also you're forgetting gems I think? Radiant Stars are back to almost 20m, so at least another 100m+ for those. (granted expecting people to pay extra for those instead of selling them seperately would be kinda far stretched..)