A common argument raised against many good ideas is some variation of "if everyone thought that way, X would happen". For example, when I was young and indoctrinated with conservatism, I was taught to think, "it might not seem like my vote makes a difference, but if no one voted, the system would fall apart, therefore I should vote". This is totally fallacious reasoning.
My decision is causally independent of everyone else's. It will not affect anyone else's decision, so if it really is true that my vote is not an efficient way for me to create change, then I shouldn't vote, no matter what would happen if no one voted.
Dear Wikipedia admins, look I understand (from making RTTP) the frustration of being a volunteer and not getting paid, but you are lying. $2.75 will make no discernible difference. Change it to say "if a whole bunch of people donated just $2.75, Wikipedia could keep thriving".