This is the best way to draw and keep satisfied members. Share the work fairly. Divide up the work so no members are doing a lot more than others. Create jobs for interested members who have special scheduling or other needs. Plan to grow.
More members mean less work and cheaper food for the members, and greater stability for the co-op.
Offer your members the largest selection of products possible, including everything the warehouse sells. Have an auction meeting only if most of your members want one. Use an extras table. An extras table ensures that people actually get more of the items they ordered and gives other members a chance to see products before purchasing them. Many groups swear by it, and rarely have any inventory left over to sell at the next divide.