I recently got an Omega watch, and wanted desperate to get the OEM rubber strap. The actual strap was $256 and the deployment buckle was an extra $256. So over $500 total. I got a great deal on the watch itself through a gray dealer and saved a ton on the watch itself so I pulled the trigger on the strap.
The buckle you can use on any strap on any omega watch which I guess is cool, but clearly super overpriced.
I think what omega charges for straps is absurd too, but I still paid $$$ for a leather rally strap with an omega deployment clasp because omega was the only brand that makes that strap specifically for my Speedy, and I love it.
Although, having handled an omega nato strap I wouldn't shell out what they ask because it's not worth it. I can get a very similar strap for a fraction of the price.
That said, OEM vs a 3rd party i've never heard of isn't an apples to apples comparison, and when you can get a german made Eulit perlon strap for less than $20 (and eastern made ones for under 10), yeah, I think $30 for a nylon strap from a company I've never heard of is nuts.
as a penance for my thread derailment Leffot is at 50% off sale, although it's pretty picked over at this point.