I'll probably make a Bone if I can't create another 'Nigma (my friend is currently using the one we made). Either way, Skulder's is superior for MFing if you're walking or something to switch to when killing a boss with Nigma.
I don't see myself not MFing with my Fishy, but if there's some wierd shortage of Skulders or I don't need to MF with him, I'd make Bone.
There isn't much use for it, though. Even Trang's Armor is a good alternative. I don't see why such an expensively-made armor would be made an option. Maybe for poor PVPers?