Every single satoshi on the Bitcoin blockchain are completely equal and the same. Now if you decide to pay more for an arbitrary coin, that is your own personal choice but that doesn't make those coins "rare". As it was said, Bitcoin is Fungible.
Every satoshi has its own unique name, number, and place in the blockchain. It also has a history of where it has been. These are all attributes that can be used to make something collectible. These factors can lead to extreme rarity whether you agree or not. Those are facts. Whether it catches on is another question.
Also all of this satoshi data can be looked up and verified all the way to the final satoshi that will ever be mined. The data has already been created all the way up to the final sat that will be mined.