There is a reason Blizzard put a cap on the AH. I don't think it's going to change.
IMO, no item is worth 2B gold.
Everything in place since release Blizzard 'had a reason' and see how many of those were epic failures and need to be fixed by patches 1.02, 1.03, 1.04, 1.05, 1.07 and 1.08 within a year?
Yeh it's your opinion, and my opinion too when it comes to equipping my own char.