Well it does depend on the amount of customers and the type of business you are. Every business owner wants their customers to remember them when it comes to the product or services provided. So when a client makes a purchase a small thank you is always a good thing. Depending on the set up of your business, if a client makes a purchase a heart felt thank you for their purchase could be included in with the purchase or shipped with the item. I thank my clients each time they make a purchase with something that I created