I think they dream these things up more while drinking claws.
But it's very, very consistent. The "Outrage you so you give us money" letters in these surveys don't leave any whitespace on the last page.
On the other hand, there are some groups I support who will send something along the lines of a 10 page, single sided, properly written letter (no random *BOLD* italic and the ever-popular "ink pen looking circles to draw your attention to the outrage of the day") explaining in competent written English what they've been doing, where they'd like to expand, and what they need to accomplish this. I'm far, far more likely to support those groups (though I generally just give locally, I've less interest in what's going on in Washington than in our local town and region).
Oh nice, we are following federal fundraising laws now. This is an improvement.