Apple’s newest version of its Apple’s iTunes Connect Developer Guide has noted that promo codes will not be available in the Mac App Store. Promo codes have widely been used by developers with paid apps. Developers for iOS apps can give out promo codes to offer free downloads to increase popularity and allow sites to review apps without having to make a purchase. They have been a valuable tool for app promotion.
With the lack of promo codes we should expect to see a decrease in reviews for paid apps. Developers will now have to coax reviewers into purchasing their apps to review instead of offering them for free through a coupon code.