I think the reason why people investing in Bitcoin is to earn profit where some are afraid that they will miss the chance to earn profit. You can say that it is very much like FUD or FOMO that they also want to invest. If they really want to invest then they should have bought Bitcoin when it didn't reach the price of bitcoin today.
Yes, the main reason why people continue to invest even in ATH is due to FOMO, and they also believe that the price would continue to increase.
But nobody knows how high it could reach and how the price would move, it could continue to go up or it could go down and have a price correction.
That's what I'm thinking also! based on the statement from other people who wants to invest their money in bitcoin, tho they know nothing but the spiking up price only. They are convinced by other people's stories that once you put money into it, your money will double or triplentl... that is true, but there is no certainty as to when the price of bitcoin will rise and fall, so it is better to do is you guys should invest at your own risk.