Pardon, but it's very clear. Take a look at the charitable donation foundations at various tech companies, many of whom publish their donation levels. Or get out and talk to some charities in the area and ask them where their money comes from.

Those making more than $100,000 give less (proportionally) of their discretionary income than the middle class. [1][2]

"as wealth increases, people become more insulated, less likely to engage with others, and less sensitive to the suffering of others."

[1] http://www.cnbc.com/id/48725147 [2] http://philanthropy.com/article/Rich-Enclaves-Are-Not-as/133...

It also creates expectations of help, which can also be very harmful in the long term. Helping others should be voluntary, not done because of expectations.