Funny money is better than no money, you obviously have never been on the recieving end of WIC, food stamps or commodities, or if you had maybe you forgot what it's like to have to go to some government agency for help.So the farmer has to take more time out of his day to go cash in his funny money! NOT! go to safeway where they are set up for them.
There are legitimate recipients of these types of help, not everyone is a freeloader. And as one other person commented, they don't want to have to take things back with them.
Take the money and deal with the extra work that might be involved and be thankful that you sold all of your produce.