A. Giving is a duty. God's law required it, Jesus endorsed it, love demands it. When you belong to a club, you are expected to pay dues. I really should share it. See, e.g., lavish dinners at Playboy Mansion for politicians.
Money provides access.
Quid Pro Quo. Sen. Robert Torricelli sends out a memo and Senators are supposed to show up. If I give to God, God will bless me. E. Giving to Extensions of Self. When I give to my spouse or children, it's really an extension of me.