“giving everyone a dollar does very little”
If every frum home in Flatbush gave at least $1-$2 to collectors who come to the door, then these fellows, who mostly collect for themselves or to buy apartments for children, can rake in at least $50 an hour. Not bad.
Remember, money given to someone who is not a qualified halachic Oni is not considered Tzadaka.
Collectors who are not Oniyim have no shame, they have Azuse.
In all cases, unless I know the collector, I don’t permit them in the house; or write a check; or come to the door when it’s late and dark.