Who is telling you to buy one whole bitcoin? You can always buy a fraction of bitcoin and hold it as a long term investment. If you really want to own "whole" crypto instead of "fractions", then go for well known altcoins like ETH, LTC or BCH (make a list and find a suitable one.
It's something that doesn't only happen within Bitcoin. I have noticed myself by reading through forums where mostly Gold bugs communicate, and the general theme amongst those is to get to the 1KG milestone eventually. People want the rarest and most expensive metal, not a cheaper, far easier to obtain metal such as Silver. Nothing wrong with that in my opinion.
In fact, the hunger for more probably doesn't even change when people own a cheaper coin, because they first want 10 coins, then 100, then 1000, etc. People always aim to increase their holding goals no matter what it is that they hold. In that regard, you can better hoard more of the best and rarest coin than to own a ton of garbage coins. Quality over quantity is what I value.