I can definitely see the argument for that, but I think there's just too much of that going on in charity today. "I'm going to fool you for a good cause" is the justification for a lot of shoddy practices supporting what usually turn out to be pretty mediocre causes.
I think it's worth keeping a higher standard with appeals to rational charity. There's long term benefit in a complete renunciation of the dark arts.
Giving money to effective charities is one of the ways we can have the biggest positive impact in the world. If you've been thinking about giving to GiveWell's top-rated charity, the Against Malaria Foundation, but haven't gotten around to it, perhaps this will help: make a donation of up to $2K and I will match it 100%. I'll match up to $20K this way.
(Any money left over at the end of the year will also go to the AMF. That makes this a donor illusion, in that you're not actually affecting the amount I give them this year.)
I made the same offer on my blog