In Ed Stetzer and Warren Bird’s new book Viral Churches: Helping Church Planters Become Movement Makers:

A study of church-sponsoring churches showed that the typical sponsor fared quite well from the experience. Worship attendance increased 22 percent for the five years after sponsorship of the church plant. Financial giving to the local church increased 48 percent over that same period, and designated gifts such as toward foreign missions giving increased 77 percent.

Seems like I read something one time about giving and it will be given unto you. Now where did I hear that?