Yes, I think this is reasonable. I would also like to take a moment to reiterate why so many people are bitter about the marketing / admin angle:

I pay them money. Charity pays consultants to turn that into more money (plus admins to manage the consultants). Consultants determine that a fraction of that money should be used to solicit more donations. Research indicates best source of new donations is in fact existing donors.

At this point charity is spending money I gave them to extract further donations from me. The ice-cream cone is now licking itself :/