The association and its members may take and execute marketing contracts, requiring the members to sell, for any period of time, not over twenty years, all or any specified part of their agricultural products, goods and services or specified commodities exclusively to or through the association, or any facilities to be created by the association. If they contract a sale to the association, it shall be conclusively held that title to the products, goods and services passes absolutely and unreservedly, except for recorded liens, to the association upon delivery, or at any other specified time if expressly and definitely agreed in such contract. The contract may provide, among other things, that the association may sell or resell the products, goods and services delivered by its members, with or without taking title thereto, and pay over to its members the resale price, after deducting all necessary selling, overhead and other costs and expenses, including interest or dividends on stock, not exceeding eight percent per annum, and reserves for retiring the stock, if any; and any other proper reserves; or any other deductions.