The wealthy people can benefit a mass of people rather than just a few, in many different forms.
One, is creating <em>social programs</em> with the government that can benefit a majority of people in less favorable conditions. Another form is that wealthy people can <em>create foundations</em> to focus its objectives on helping poor people or any other group that needed support. It could be children, minorities groups, the elders, among others.
If rich people invest money in these programs, they can get some benefits like social recognition, presence on Mass Media and a better public image in the community.
In the late 1900s, a philantrophic and entrepreneur called Andrew Carnegie wrote an essay called the Gospel of Wealth. In the document, Carnegie elaborated philanthropic projects with the goal of benefiting majority people like the poor. The intention of Carnegie was to change the extreme ideas of Social Darwinism. He considered that the rich should be thankful for their wealth and a way to show it was helping people in need.