Multi-National Corporations and other important non-business concern brands use it to get connected with the audience. If you are looking to get sales conversion at a higher rate than expected, then it is impossible without your significant presence on Instagram.
Once you get establish with the sales and basic brand structure then who will give your promotional offers and updates to the customer? Instagram is there for you. The active followers you buy will keep sharing and tagging the important things.
If you do not want your customers to miss a single moment of your service then keep telling what added value you are providing. Teasers get launch by celebrities to get a promotion. Millions of people following the brand rush towards it causing a major increase in sales.