Advice Worthy of T-Shirts –DeWese

So, there you have a third sales principle: sell add-ons. Don't limit your offerings. Laura Laaman, writing in the Dayton (OH) Business Journal, offered, "Selling 
add-ons are a win-win. The win for the customer even though she/he is paying for additional products or services, there is often an increase in satisfaction with the purchase, as well as increased convenience of one-stop shopping."