Watches are a fashion accessory and have a very wide price range. I consider watches under $150 to be low end, under $400 to be middle end and above that to be high end.
Headphones are different because (until Beats) they were mostly about function and not form. You can get very good sounding headphones for under $100, which is why people whine about Beats being so expensive. Beats's innovation wasn't making good headphones, it was making headphones into a fashion (so they could charge a lot).
Yes, seriously. Beats headphones didn't add anything new to headphones except looking cool (and mostly because of the brand name and not because they look particularly good). None of the Apple products you mentioned were like that—they all added significant innovative features in addition to having a beautiful form. The hipness of the brand followed that instead of leading it.
Headphones are different because (until Beats) they were mostly about function and not form. You can get very good sounding headphones for under $100, which is why people whine about Beats being so expensive. Beats's innovation wasn't making good headphones, it was making headphones into a fashion (so they could charge a lot).