Children's books -- the good ones, anyway -- work because they realize kids won't put up with the crap many authors want to shovel onto them. The story has to stay simple, on-target, and focused on the reader.
Fundraising -- the good stuff, anyway -- is just like that!
As noted at the Communicate! Blog, at 5 lessons for nonprofits from children's books.
The important conclusion -- one that can make any fundraiser who grasps it into a superhero -- is this:
Great writers make us feel that the ending of the story depends on us.
... you want your readers to feel that they are irreplaceable. If they can see their donations as the key thing needed to ensure a happy ending, they will not only give. They will want to give. So much depends upon their heroic action!
That's it. How to succeed at fundraising.