When meshulachim come to my door late at night (as they often do), they are invading my daled amos inappropriately, and I will not open my door late at night to ANY stranger. There are thieves who dress up like chassidim and pretend they are collecting, in order to get someone to open the door at night. Sorry. Don’t do it. And if I don’t answer the door (as happened recently because I was injured and couldn’t get down the stairs, STOP banging on it or ringing the bell. I am happy to give tzedaka (wish nobody NEEDED it, though), but some meshulachim forget that balabatim are ALSO people.
And if you really want to know why some meshulachim are ignored, maybe they had the chutzpah to tell you you did not give them enough money and they’ll take a check. Or maybe as one guy did with me, they throw the money back in your face because they don’t like the amount. That happened to me. Someone who REALLY is collecting for ehrliche reasons, will not turn any contribution away, and certainly will not act like a bulvan.