Damn, I Wish I Thought of That! reveals The worst market research in the world:
Your own opinion.
Too many fundraising campaigns are based on what some fundraiser (or her boss) thought would just be super-cool and ultra-persuasive.
It never works.
We aren't our donors. We're freakishly unlike them. Probably the only thing we share is we believe in the same cause. But even then, what you think that cause is about is probably not much like your donors' view of it.
The next-worst type of market research is focus groups and surveys, which tell you what people think, or worse yet, what they're willing to say out loud -- not what they actually do.
The only market research that leads you to more useful knowledge is actual donor behavior. You can take that to the bank.