Reward biggest customers
Have a few customers that come to you religiously for your product/service? Why not reward them? Offering your larger repeat customers some type of reward is an excellent way to thank them for their business. It can also foster a ‘friendship’ between you and the customer that will result in better word-of-mouth advertising for you.
This can also motivate your smaller customers to purchase more from you by offering them some kind of reward if they order X amount of product from you. Rewards can be anything from free shipping, free upgrade to express shipping, free downloadable products, free discount codes, etc.