Actually, in large, professionally-run fund raising activities, it is not unusual to go to large donors first, in what is known as the "silent phase." They try to get 50% of the needed funds that way before going public. Libraries, art museums, symphony orchestras, hospitals, public television/radio, etc. do their fund-raising this way. In one situation of which I know, an individual donated $500,000 to a $7.5 million project, and then she offered to match the next $500,000 raised. The dollars just flew in, and the necessary funds were had in less than a year!