I think their main selling point is they don't touch the disc, and so there is no wear
Also once you go beyond a certain price range in audiophilia, it's diminishing returns and a slow descent into madness.
I want to say I read something once about some kind of filament stylus, that still made contact with the grooves but with less friction and force than a normal stylus. I can't seem to find it now but that seems like a better solution than this.