Hell doesn't give you the items you need to beat A2 inferno. You can farm it for a thousand years and still be under-geared for A2 inferno, the difference is that great.
I farm specific spot in hell mode for gold, i make about 150k per hour and get to use all crappy gold find and magic find gear to do it.
I make about as much as you could make doing it in inferno, which requires actual gear to do, and a lot more effort.
It doesn't matter if anything good drops or not because that gold goes towards buying better gear for inferno, so yeah it's more than worth it, and it's easy, and you don't have to pay attention and can watch a movie or something while you do it.
So you didn't farm the gear, you farmed gold to use the AH.
Now, consider for a second where the gear on the AH came from for you to buy. It didn't come from Hell, it came from Inferno...from classes that were originally broken (Force Armor Wizard, for example) getting early graces on the gear there. It's circular.
There is a problem. People who think there isn't are either trying to argue against it to make themselves look 1337 ("Oh, I completed Inferno fine, you jez not got the skillz, dawg") or are burying their heads in the sand.
It was stated by Blizz you'd need to farm Hell to gear up for Inferno. People accepted that and thought it was a good idea. The problem is that it simply isn't true.