Have you ever considered they might actually have invested in Bitcoin and since they do have a lot of money they just want to do what they wanna do since it's their money? Perhaps, most people don't know how to or afraid to invest in cryptocurrency since there's a great risk on it if they don't know how to deal with it.
I hope that was just your two cents but it seems like you are always judging people the way on how they live their lives. There's nothing wrong with picking up a girls every week if it makes them happy. You should try it too if you think the world only revolves around in your country.
Accepts differences, cultures, norms and practices since they didn't choose to be born in that country.