I mean, they are so rich, they can start to mine Bitcoin, even if they lose some money they shouldn't care, they are ok with all those money they already have.
Am I wrong?
If you become rich and you are doing the dream life that everyone wants is thanks to Bitcoin, don't let him die.
Rich people are not mining as they don't want to do that's it. It is not necessary for people to go for mining if they are rich and it all depends on one's interest and thinking. If people are being rich by investing and trading then why they would prefer to go for mining as mining is little bit harder game than trading. And don't worry bitcoin is not going to die, there will be up's and down's, you just need to be holding with patience for getting profit from it.