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

https://www.coast-bookmarks.win/some-discontinued-rolex-models-quietly-outpace-their-original-prices-and-it

Why do some discontinued Rolex models consistently trade above retail? Take the Kermit 16610LV or the Pepsi 126710BLRO, both with strong collector demand despite no longer being made