Christian Junk Mail and Worldly Marketing

I've just received a letter from 'Kate'. Who is this lady? She must think I'm very special! Whoever she is, she's just been to India and wishes me to know about it. She hand-wrote a little note on the envelope because she must have addressed the envelope to me personally.

Opening this mysterious letter with great anticipation, I see more handwritten notes alongside the main, typed text. I feel highly privileged. I must be very important to her. 
If turns out to be Kate Gent, the 'Donor Partnership Officer' at The Leprosy Mission, a Christian charity I've been supporting for a few years now. She's felt the need to write to me to ask for some more money. That's okay, it's what charities do, and I've sent them extra in the past. But why does she seek to patronise me with pretend notes in her handwriting that's just as much a part of the printed text as the main body? It's a cheap and worldly marketing trick. I've noticed the Bible Society doing it, though their missives arrived each week until I told them to stop. 
I would far sooner my donations went to help lepers, not swell Kate's marketing budget.