I think you have every right to question the Joque's price. It's way overpriced in my opinion.
It is nylon/spandex! Those materials don't cost that much and are easy to work with compared to leather and steel. Plus, while it is machine washable, doing so will cause the pouch to loosen up faster and render the harness unusable.
I can see spending $100 for a harness that will last my entire life (like the Jaguar) but not for the Joque, which will eventually wear out like an old swimsuit. Yes, it's comfy, but that's pretty much all it's got going for it.