I am sure Warren Buffet does and pays good money for security. You do know kidnapping, extortion, and ransom existed prior to the blockchain right. The issue here is that this "Satoshi" may not be the "Satoshi" and thus doesn't have the resources to pay for that kind of protection from every nutjob and sociopath who sees him and his "million bitcoins" as a ticket to the easy life.
Still it is possible to use multi-sig to provide the same level of limited access to bitcoin wealth that applies to bank funds.