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

https://future-wiki.win/index.php/What_Happened_on_September_1,_2020,_with_the_Rolex_Hulk%3F

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