I agree with other forum members that even though you have rare Satoshi or Bitcoin for example, it's value won't be higher or lower but if there are people who likes or wants to have that Satoshi like a collector then maybe he/she might/will buy it much higher price (who knows). For me, it doesn't matter if it's rare or not because Bitcoin is Bitcoin even though you have rare Satoshi or not. There could be people like that in Cryptocurrency or maybe not unless someone will tell us if there are people like that.
I'm not sure what you're trying to say here, but as far as I can see you can only see that there are bits that have been use to buy the legendary pizza, you don't know exactly bit it is after a transaction, so there is nothing to collect here and it is just purely for decoration. I doubt you can extract those every single bit that have been used to the purchase. And well, we might all have rare satoshi that have been gathered for historic exchanges heist before, who knows?! Hopefully it won't be bigger in the future, I hate to think that bitcoin have a rarity like fiat
