Had that same idea recently. I think Julie here did something like that here back in the winter. Just keep in mind when electronics get mentioned and you advertise you might get a visit from the local EPA. I would research it a bit more before you put your name on some kind of advertising. Thanks for the post it reminded me to pm her about how she went about the fundraiser.
Instead. Of breaking stuff down and getting paid and then cutting the check, maybe you could buy what ever is turned in right there get them there money and still make a profit. I don't know if having a fundraiser waiting to get paid would go over to good. You never know what comes up during the time you take to break stuff down. After you pay them then you can take stuff apart on your time frame without having someone looking over your shoulder waiting for their money. Just a thought. Good luck.