This is an interesting general question that would deserve more attention: What do top executives in a company really do to bring the business forward and how do you measure it? How do you measure today whether the decision to invest 10 billion in drone delivery today will lead to a huge ROI in 10 years?

I think you can't because you can't predict the future which means, the high payment of executives is simply based on trust (by the company owners) that they will do the right things for the company.