Because it is the easiest investment to have?
It could give you a huge profit if played right.
Easy to buy or sell anytime you want.
You could hold your own investment if you want (By putting it on your hardware wallet).
yes we can all compare it with 5 years ago. Besides that, rarity will continue to occur because almost 21 million bitcoins have been mined
Even if that is an easy thing, most people can hold their bitcoin for a long time. People tend to panic when the price starts moving up or down because they may not be ready to see that happen. A small number of people can survive to hold their bitcoin because they can control their emotions and decide not to watch the market very often. If they can hold it, they will make a big profit in the future.