So basically you're saying it's a psychological thing.

What I'm saying is... if we did set it up so that you could donate and getting nothing as well as paying for PM space with proceeds going towards the same cause... what would be the point in choosing option #1? Unless you actually had a personal thought that you did not wish to have more PM space, I don't see the logical viewpoint. I know not everything works by logic, so I'm guessing it's psychological on some level.

Also: Not many people want postcards unless they're postage paid.