There are several companies that chose to have a fixed % of their income donated to a charity or non profit of their choice.
We can mostly see it in lifestyle businesses that support a health related cause or companies that support a school or home for underprivileged, orphaned or ill children. From a company vision or mission point of view this is making a lot of sense, especially if the company is creating a program around the cause, like team building or sport events and is encouraging employees to spend time with or for the cause on company time. Benefits for the company:

• increased engagement and loyalty
• more mindful and kind workforce
• sense of purpose, satisfaction and pride
• sense of community
• increased creativity

Not crazy at all. Here's data from research on corporate support of nonprofit organizations and customer perceptions:
Cone, LLC has been conducting cause-marketing research for twenty years. Some key findings in their most recent study include:
• 93% of Americans say that they have a more positive image of a company when it supports a cause or an organization they care about – an increase by 8% from 2010.
• 91% of consumers want to see more products, services and retailers support worthy issues – an 8% jump from 2010.
• 90% of Americans are more likely to trust and would be more loyal to companies that support causes.
• 82% of Americans make purchase decisions about where to buy and what to buy based on the extent that a company supports an issue.
• 82% of Americans would recommend a company’s products and services to others based on a company’s commitment to educational, social and environmental issues.
• 88% of Americans want to hear about corporate social responsibility efforts and those messages must be authentic and clear.

The term philanthropy suggests more than giving to charity or to your church. Giving to charity or your church is a habit that is good to do no matter where you are in life - just starting out, having a family, a seasoned manager or retired. Philanthropy, rightly so or wrongly so, implies being passionate about cause(s) and begs for your time and talents along with big chunks of money. People just starting out or raising a family typically have concerns that are centered around their career and their families - not causes. I have met a number of twenty and thirty somethings who have stated that they do have causes to back, contibuting $25-$100 per year just doesn't seem like a philantropic endeavor. In other words, life sort of gets in the way of being philantropic before "we get there". Another viewpoint, comes from an estate standpoint. Those of a certain age who have "made it", certainly want to leave something for their children but not necessarily all of it. They would like to do be part of a cause while alive or after they have died. It is easier to see the good that philantropic deeds can have when you are thinking about mortality.