These guys actually seem to be using D60 kncukles/hubs/etc.
A bolt-in set of Currie Rock Jock high pinion Dana 60's will run you about $7000 US (at least for my JK that's the price). But then again, we're not talking apples-to-apples here. The Atomic price looks to include carriers, gears, and ARB lockers as part of the purchase price, whereas the Currie does not.
Currie axles at 7K plus new lockers and gears...there's 10K. Add some more change if you don't have disc brakes ready to bolt up.
Atomics seem to come with everything including disc brakes. All for 14K. Still more money, no doubt, but each person needs to decide what that ground clearance is worth. That extra 7 inches sure isn't cheap, but if we were smart with our money we wouldn't own Jeeps.
The other thing to keep in mind is that in terms of clearance under the pumpkin, you need to add TWO inches of tire diameter to get ONE inch of clearance. For instance, going from 32's to 35's only gave me an extra 1.5 inches of clearance under the diffs. In order to get 7 inches extra clearance under the diff, you'd need to increase your tire size by 14 inches. Sure, clearance under the diffs is only one of a large number of things to look at in a rig...but those axles do look to offer an interesting advantage.
HPS4evr has a point too - these are not the only game in town when it comes to increasing ground clearance. Unimogs axles are a potential solution, and they also offer extra gear reduction within the "portals" at the end of the axles - if that floats your boat