When the time is right, do not hold back from mentioning the privilege of supporting the Kingdom work financially.
Ah yes, the constant subtle (and not so subtle) begging for money, just like the churches they claim to be better than. Of course it is because they have fallen away from the true teachings of Jesus Christ who reportedly said, ". . .You received free, give free." (Matthew 10:8)
As I have commented before, after ethically sending in a large nearly seven figure bequest from my father's estate the greedy money grubbing leeches sent a letter asking if that was all, or if I was going to send them more. And to date ten months later still not one damned word of thanks for what they did get!