Local Businesses are paying $5,000 or more to develop mobile apps to reach out to their Customers. And a business usually requires different apps for each type of phone (iPhone, Android, Windows phones, etc.)
Small businesses have a hard time getting their customers to install their app (Who would bother to install an app for their local pizza place just to get coupon notices?)
Even if a customer installs your app on their phone, less than half will enable notifications which means a business still won’t be able reach them.
Bottom-line: Less than 5% of the average business’ customers can be reached with regular push notifications. Having a mobile app built just for the push notifications is not a profitable investment for most businesses.