For many businesses, the goal of a platform like Instagram is exposure. You may not make direct sales off of a post about a product or a service, but you can generally reach people who are interested in what you offer. You create more brand awareness, and you can get direct followers whom you can interact with in the future. It’s a dream situation for businesses, as they can then market to people who already like their products and are far more likely to make a purchase. That can increase your conversation rates dramatically.
The other side of this, though, is that you need to expand your reach in some way. You have to get your content in front of new users.