Actually there is one world where people get paid based on how hard they work, and what they are willing to risk to help others. Then there's the world where somebody gives orders, and shoots you if you disobey. Later, he says it was for the 'common good.'
An entrepreneur/ businessman risks more than a regular worker. If you lose a job, you go to zero- you have to start again. If an entrepreneur loses his job, he goes negative- getting into so much debt so fast that it will take him a long time to recover. Only a madman would take such a risk if it was not compensated more.
Hence inequality is necessary, even justified, as long as the welath is attained fairly- through investment and enterprise, not by stealing, regulation, price control cheating etc.
