Campaigns are about issues and appealing to people's interest. The people's interest are a politician's primary concern during election years, but the problem is that after the election lobbyists go to work and the politician's primary concern becomes the lobbyists' interests because they are the loudest voice and can make or break a politician in the next election.
I agree that people do not currently always vote in their own interest, and one of the reasons for this is that lobbyists are able to convince people that they don't want something they should. That's the power of propaganda. Lobbyists don't just lobby politicians -- they lobby the people too. One of the systems primary services will be to debunk lobbyist propaganda.
Also, $3 per month isn't a hard number -- $3 just shows how little money it would take to change the game -- compare that to how much extra we are paying in taxes to pay for unnecessary expenditures.