In order to facilitate the carrying out of their responsibilities pursuant to this chapter, the produce dealers that operate in a market may organize an association. A produce dealer shall not be required to become or to be a member of such association, but any such association shall admit to membership any produce dealer that operates in the market. If a produce dealer is admitted to membership in the association, he shall not be subject to any assessment or payment except those which are necessary to carry out his responsibilities pursuant to this chapter.