Here's a big sales loss. It's extremely important before you sell your first product to already have your follow-up product at the door and waiting. If your customer has purchased from you once, there's a good chance they will again. You have already established a certain kind of trust with your customer. Don't let them down and never rely on one primary product to carry your business.
Product development is an integral part of any business.
If you want to stay in business keep your present customers coming back for more. Every business will run into this problem sooner or later. No matter how good you are, you are bound to promote a poor marketing campaign or product. When you need a fast way to stimulate sales for a product that is not selling, try the truth. But know how to use the truth to your advantage.