Everyone wants to be the leader, manager, executive, financier, politician, general, and king – until they achieve that status. And then they realize that they hold those positions because others want them to, and those that want them to, are customers that they must keep satisfied, or they will find someone else who does treat them as customers.
Why is it so hard? because all customers have different interests, and all leaders have but one fundamental job: to apply scarce resources behind the best returns. And that includes defense of the organizational capital against members since all organizations consist largely of people who seek rents on that organization.