Why do some discontinued Rolex models sell for more than their original retail...

https://chancevwpt210.wpsuo.com/which-discontinued-rolex-categories-are-lower-profile-but-still-strong-performers

Why do some discontinued Rolex models sell for more than their original retail price? Take the Kermit 16610LV or the Oysterquartz, which had fewer than 25,000 units made—scarcity plays a big role. Then there’s the story behind the $17