So you have a product that you sell locally, for now. Whether it is a local cupcake business, bread producer, toy manufacturer, etc. this will apply to you because your goal is success and the more success, the better…right?
Growing your business requires incremental dollar sales month over month, year over year. Holding everything constant (product, price, distribution, placement, etc.) there is no reason to believe that the customers that you currently sell to or the shop that you currently sell at will produce more sales one year over the next. Therefore, the only way to grow when holding everything constant is to increase the number of stores that you are selling to.