I think it's more effective to ask for a specific dollar amount. If you notice, radio pledge drives and the like mention a "suggested donation amount" constantl

I think it's more effective to ask for a specific dollar amount. If you notice, radio pledge drives and the like mention a "suggested donation amount" constantly. That way you short circuit all kinds of over thinking people do. Ask for $100 then tell people if they can't afford it, to give less, and that every bit helps.