Apps are huge and are getting bigger. The proliferation of tablets and smart phones is likely a done deal and will never reverse. Most of the big name shopping brands have an app. But if you have ever shopped around for a service to make you an app you will probably have been scared off by the price.
But the good news is that getting a smart looking app for your business doesn't have to cost anything except a bit of time.
There are lots of advantages to having your own app as follows:
It is another way to keep your products in your customers mind. An icon on their smart phone is a constant reminder and a click away from your latest special offer or article.
Publishing on Google Play is yet another channel to be utilized. I know people who spend more time searching for apps than they do for websites. If your products are not in an app they might never find you.
Credibility, that is, having a shiny "Get our app on Google Play" badge on your website gives the impression that you are...