Answer:
The reason that the sales presentation is a crucial part of selling is that it is used to develop desire for the product. A good sales presentation should be able to convince the potential customer that the product is something they need or want. Of course, it's important for the salesperson to also show enthusiasm for the product, but ultimately the goal is to get the customer excited about the product as well. While explaining after-sale services can be important, it's usually not the main focus of a sales presentation. And while a salesperson may learn more about the customer during the presentation, the primary goal is to create interest in the product.