I had no idea that this cap existed. You know, when I find an item (Legondary) in the game and I can't use it, I go to the AH. I look for other legondaries with similar properties by filtering the results. So far, I have not found an item where the AH has similar items for more than a few million.
However, I guess I would be pissed if I found an item that is slightly better than the 2 billion gold items I see at AH. I guess my alternative would be to go to the Real Money AH and again find what similar items are selling for. Then I would list it there at slightly above what the others are going for.
The problem with that for the players above is that they have billions in gold but no real money ah connection. Or, they have that connection but do not want to deal with the real money option. Or they have other reasons. This is a senerio where the items they want is still with Blizzard (not a 3rd party) but for some reason, they do not have access to them.
I am for keeping a better value to the gold. Part of that is for the game to have less gold so that the gold that is out there has more real money value. I will not go into all of those reasons here, however, I would like to point out one thing. If say the cap were not there or extended to, say, 5 billion, Blizzard will get the 15% commission on the gold, taking massive chuncks of gold out of the game. 15% of 2 billion is 300 million gold, while 15% of 5 billion is 750 million gold. I know it is not much different in the grand sceme of things to the economy, but every little bit helps.
If a person wants to sell for more than 2 billion gold and a person wants to buy for more than 2 billion gold, I say, "why not?", It helps some players, it helps the economy, and it may avoid some shady (or not so shady) 3rd party sites making money off of what is clearly Blizzard's money to make.