Just because something motivates someone to do great things doesn't mean it is good to offer that reward. If someone was motivated by the desire to own slaves,

Just because something motivates someone to do great things doesn't mean it is good to offer that reward. If someone was motivated by the desire to own slaves, etc. In light of the fact that increasing wealth has diminishing returns in terms of utility, what if the desire for extreme wealth is simply the desire for power? How much power inequality is acceptable in a democratic society? Couldn't you motivate people with fame instead?