Because Bitcoin is not important to our future finance system. It does not solve any problem that any meaningful fraction of people cares about.
People speculate on loads of assets which have no real life utility. For example, art or classic cars.
Also, Bitcoin has value and if you wanted, you unlock it and spend your money without even selling your asset, there was a discussion the other day about defi, highly recommend checking out MakerDAO if you want to have a practical use for your Bitcoins.