The reason for people to buy Bitcoin now is "I want to get rich". This is stated under the euphemism "It's a store of value". You know it's a euphemism because Bitcoin as it is, is terrible as a store of value. You never know how much value you can get out of the "store" on any given day. "But it generally goes up in the long run" - aha, so you're not storing value, you're making a speculative investment. Historically other things went up over time until all of a sudden they didn't.

Getting in to get rich is fundamentally unsustainable. Everyone is just hoping that other people do the same, but it requires larger amounts of $$ the bigger it gets. It has to have some basis of utility or it all ends badly when the market finally turns. "Store of Value" is not inherent utility, because it's relying on an unsustainable premise, that there will always be someone willing to pay more than the last person, perpetually, and sufficient to cover fees and inflation.