Yeah, the price is a bit outrageous along with the bright idea to offer a high pinon, semi float, rear axle for a rig that can easily weigh between 5-6k lbs. Not to mention the tails of guys with mildly built JKUs, with stock drivelines, bending currie's 40 spline semi float shafts.
Here a pic straight from Currie's website that shows the bolts on the JK iron RJ rear:
Looks they might me changing things around a little for their new RJ 70 housing, but they say that the final product might differ:
But for the price of any of those custom built units you could build quite a few pimped FF 14 bolts . . .