In my personal opinion, people are still buying bitcoin because bitcoin still has a good value and it is worth to invest on it because it is a long term investment. Bitcoin is really a good help for.people who needed money very much that is why they buy bitcoin for them to earn a more better earnings.
And why won't they buy btc? I mean we've seen how it's value can go up and we've seen how it's value can plummet. All the more reason to buy since riding the volatility can guarantee money. Most people who buy in now are probably after that anyway more than the tech behind it lol.