It's simply come too late. This would have been GREAT in the early days to make it easier to jump into Inferno (since everyone could do act 1 for materials unless you're terrible). At this point though, it's just not going to be worth much of anything.

Let's do some fun math. In order for an amulet (for example) to be worth 20+ million on the AH, it has to really roll 6 good stats. The good stats are:

LOH

Crit chance

Crit damage

Mainstat

Vitality

Average damage

All resistance

Life %

Life regen

Magic find

IAS

I listed all the possible affixes that people would consider useful. Now we'll have mainstat always, that's a given. The trouble comes from the other stats. There are 30 total possible affixes that can roll on an amulet. Out of those, in order to get a truly great amulet, you need all 6 to at least roll one of the useful affixes. The probability of this happening is

(10/30)*(9/30)*(8/30)*(7/30)*(6/30)=about a .1% chance, or 1 in 1000.

So since these things will cost roughly 150k in materials, you can expect to spend 150 million on something worth maybe 50 million.

Now when you consider that all these affixes need to roll pretty high to be valuable as well, the chance falls even farther. I'm not going to calculate the probability of that since it's going to easily push the average cost of a great amulet into the billions.

Even if you only want 4 good affixes (so mainstat+3 good ones), you still only have a 2.5% chance of getting that. So you'll have to spend 6 million gold on an amulet that you could pick up from the AH for much less.

Let's do some fun math. In order for an amulet (for example) to be worth 20+ million on the AH, it has to really roll 6 good stats. The good stats are:

LOH

Crit chance

Crit damage

Mainstat

Vitality

Average damage

All resistance

Life %

Life regen

Magic find

IAS

I listed all the possible affixes that people would consider useful. Now we'll have mainstat always, that's a given. The trouble comes from the other stats. There are 30 total possible affixes that can roll on an amulet. Out of those, in order to get a truly great amulet, you need all 6 to at least roll one of the useful affixes. The probability of this happening is

(10/30)*(9/30)*(8/30)*(7/30)*(6/30)=about a .1% chance, or 1 in 1000.

So since these things will cost roughly 150k in materials, you can expect to spend 150 million on something worth maybe 50 million.

Now when you consider that all these affixes need to roll pretty high to be valuable as well, the chance falls even farther. I'm not going to calculate the probability of that since it's going to easily push the average cost of a great amulet into the billions.

Even if you only want 4 good affixes (so mainstat+3 good ones), you still only have a 2.5% chance of getting that. So you'll have to spend 6 million gold on an amulet that you could pick up from the AH for much less.