Why do some discontinued Rolex models trade above retail? Take the Kermit...

https://www.slideserve.com/gierrepjfu/is-a-rolex-with-papers-but-no-box-still-considered-a-complete-set

Why do some discontinued Rolex models trade above retail? Take the Kermit 16610LV and the Hulk 116610LV. Both stand out with unique green bezels and strong collector appeal