Batman does that already. Hes runs the largest charity on earth:

The Wayne Foundation is the holding company for the Thomas Wayne Foundation and the Martha Wayne Foundation; it is the largest transparently operated private foundation within the DC Universe. The primary aims of the foundation are, globally, the arts and humanities: to enhance healthcare and reduce extreme poverty, to expand educational opportunities and access to information technology, and to fund scientific research and help altruistic people with research by providing facilities and training.

The foundation has its own building, called the Wayne Foundation Building, which includes a penthouse where Bruce Wayne lived for a period of time. It also has a secret elevator that leads to a matching Batcave in a secret sub-basement under the building.

Through the Wayne Foundation and the affiliated organizations underneath, Bruce Wayne addresses social-economic problems encouraging crime, assists victims of crimes, and maintains connections to the streets through the soup kitchens and social services groups; all of which augments his crime fighting efforts in a way that his Batman persona cannot. This arrangement also provides a large network of connections in the world of charities. He finds out about the newest trends, sciences and the arts.

Thomas Wayne Foundation

The Thomas Wayne Foundation is a foundation for medicine and medical help. This foundation gives annual awards for medical breakthroughs and lifelong commitment, similar to the Nobel Foundation. The Thomas Wayne Foundation is also responsible for funding the Thomas Wayne Memorial Clinic in Park Row, Gotham's infamous Crime Alley. The foundation funds and runs dozens of clinics in Gotham. Bruce Wayne's surrogate mother, Dr. Leslie Thompkins, runs the Memorial Clinic in Crime Alley and governed the other clinics until she left Gotham.

Martha Wayne Foundation

The Martha Wayne Foundation is a patron and supporter of arts, families, education, and tolerance. The foundation supports and helps to run a number of orphanages and free schools, and provides teachers for those who have learning difficulties. Artists can apply for grants from the foundation to help support them in furthering the arts. The foundation sponsors companies like Family Finders. Family Finders is an organization directed at finding lost people and uniting families. The Martha Wayne Foundation also sponsors and runs dozens of soup kitchens within the city.