@djc I guess here we'll disagree. If Galt must be motivated by money, he must be motivated on a scale that lets him buy Twitter or finance Fox News (or MSNBC! Whatever!). The social cost of that far, far exceeds whatever technical contributions sociopathic motivation can make.
Fortunately, sociopathic motivation may be relative! If Musk is motivated by being richer than Bezos, downshifting the entire scale may have very little motivational effect!