> They are going inside the computer where they aren't visible.

Speak for yourself :) My computer is pretty open, the fans are visible through the front and through the side panel.

I don't run RGB either though but I do like to style it.

And of course the "form over function" is part of that market niche that really pays a lot for something like a fan. Noctua aren't that special, as others have mentioned there are much cheaper brands with the same performance including sound level. You do pay a lot for just the branding.