After looking a second time at the pic of that JK I noticed the RCV CV axles in the front - and I'm guess they're on the rear too.
Those babies alone are $2000 per set - so it's not hard to see how you can get to 20 grand per end pretty easy.
All that said though - I think that would be a SWEET Jeep for running dunes or high-speed off road events like the Baja. And it's sure to ride nicely on surface streets too.
Bob
Rear is a solid axle not IFS
one of the other photos shows it better
so only the front is IFS