Since the cost of maintaining a virtual currency is extremely small, there is no practical limit. Of course, some small number will dominate. For a parallel situation, look at home many Linux distros there are: http://en.wikipedia.org/wiki/Lis... That can occur because one person, with enough free time, can package there own distro. But a handful of all distros represent the majority of all Linux installations.
According to the figures in the infographic Bill Gates has given $28 Billion to various charities since 2007, which apparently accounts for almost 48% of his net-worth. One of his biggest charitable efforts has been towards the eradication of malaria and an end to polio.
A gift of shares worth$1.5 billion from Bill Gates net worth was donated to The Bill & Melinda Gates Foundation. The huge Bill Gates net worth allowed Gates and wife Melinda to be the recipient of India's third highest civilian honor Padma Bhushan in 2015 for their foundation's philanthropic activities in India.