Yeah, Vidiot, not my proudest moment. I seem to remember having been quite unwell (not in any contagious way) on the day, so I wasn't particularly patient with them. Also, IIRC, I was probably still a bit shellshocked after finding out that they stopped going door to door during you-know-what. It's a bit like the Catholic church suddenly saying Peter wasn't the first pope. Door to door was THE proof that they were God's true religion, right up until it wasn't.
Your instinct to always follow the money and their charitable status is probably at play here. Door to door work doesn't bring in any money any more, so it doesn't matter.
Which begs the question, if the door to door work doesn't matter, what does?