Reason 1: You are in control of your own money - government overprint cash which devalues the dollar, but big influential people and institutions can devalue Bitcoin with a single tweet. Bad news, issues with mining, and other things out of your control can devalue Bitcoin.
As much as the price of bitcoin can drop in with a single with it has also soared as well several times in the past. For instance, the price of Bitcoin skyrocketed from around $32,000 to nearly $38,000 in January 29, 2021 because of a tweet from Mr Musk. This is just one of those few examples.
My two reasons for investing in bitcoin is that I believe that someday it’s going to be a widely accepted legal tender and then price will get to the moon. In addition, I don’t want to live with the regret of not buy any bitcoin before it becomes mainstream.
I like the last point you mentioned, the regret issue!
Really, even if there is sometimes a bit of doubt that all pans out and Bitcoin could be replaced by another new technology, that is just how technology works, I would still be mad at me if I didn't try. I believe in Bitcoin and letting doubts take control over your own belief and passion is very regrettably. If it turns out I was wrong, fine, it was worth the ride!
I strongly believe that we are still in the early ages of Bitcoin and we all made the right decision to get involved as early as we possibly could.