Growing up i always remember my elder father stepping up to the plate and making up the financial deficit of the congregation. For the most part in the western world the bulk of the donations come fron a few.
In my area congregations are supported by the 65+ jws who open up their wallets a little too generously. Once this generation dies off, things are going to get tougher.The younger generation just doesn't it have it to give.
As to getting contributions from people at the door, it isn't happening. NO one that I know asks for contributions. It's never mentioned at the meetings and it hasn't been encouraged in the last 5-6 years. Even if someone from the territory does contribute , it usually a pittance.
Thanks Julia for bringing this up.