There are a couple ways you can do it, I know the issue of "Taking things for free makes other people think you are up to something...etc"
And then there is the catch of being paid for stuff or certain stuff or people accusing you of making them pay for something to be moved that your making money off anyway.



charge a fee, cover your overheads and let the people know that for every dollar, 1/2 will go to disposal the other half goes to a charity of the organizations choice. Dunno how it works out there in the states, but people will let the money flow if they also get a "feel good" motion out of it as well. Just a thought. This template can be worked many ways.