Sorry, but I do fund raising for a living, and I can tell you, carpet bombing is not only effective (it got me to make an additional gift this campaign, in addition to what I give monthly to FR), it is essential.
We have to enlighten people that it costs money to provide this service. They use it; they benefit from it; they should pay for it. It is called appreciating what you have. And that is true, even if you only have a widow's mite to give.
So, carpet bomb away and don't let the naysayers get you down. Freedom, and FR, are a privilege, not a birthright.