I have read about giving as one way to be blessed.
Giving can come in form of anything; it could be giving of your time to a course; talent and gift, resources and so on.
I am sure of one thing however, giving of anything can increase your own happiness and good feelings, but is giving a factor to becoming wealthy? I am aware of the Forbes list of the richest, I am yet to hear any of them attributing his wealth to giving away if his resources.
You have many such examples, like Bill Gates.
He donated 99 % of his wealth and through his foundation helping less fortunate people in Africa, with medicine or in other ways.
Very rich people have more money than they need or can spend kin their life time.
So, many of them feel that they wants to do something for their community or the word.
After all, you can live only in one house, drive only one car etc.