The problem $ 50 billion could not Wipeout

Again talking about perspectives, which always are interesting I was gathering data on top 10 philanthropy contributions in America alone:
http://www.forbes.com/top-givers/
I hope not to contradict or prove anyone or anything wrong or right. The other side of this will also be analyzed.
I found out that it was in the range of  $ 89 billion   and that is 59,48,97,80,50,000.00 Indian Rupee.
This was a rough summing up, please do correct me if otherwise.
Now considering this - the population of the world is just 7 billion.

Now this was given by the generous souls in their life time meaning the good work helping the needy had been going on for 20 years atleast?

Let us get a bit generous and give them another 10 years, which by current disruption age is huge. Whatsapp valued itself at $ 6.8 billion in 5 years.
Now thats a huge amount Rs. 59,48,97,80,50,000.00 and time - 30 years. Can we say that there would no longer be any poor & needy people in 2025?

This, am analyzing just top 10 givers of US. We then have lakhs of them across US and further down across the world? Would philanthropy be atleast $100 billion for last 20 years?

Now consider this, we know there are rich helping the poor and needy, would it be possible that is the case for last 100 years?