I think this argument is much stronger in the opposite direction: if his motivations were not focused on accumulating wealth, he’d be retired or running some kind of charity once he was that far past the point where he had to work. The fact that he’s not suggests that he derives his self-identity from wealth and the guys who do that are rarely satisfied at mid-tier rich.
I also can’t name a single CEO who had the mentality of “I’m rich enough to make personal/financial sacrifices for the good of the company.” That’s simply not how things work. I’m sure an example exists but it would clearly be an exception to the rule.