One thing that happened since 1999 is the rise of price discrimination at fast food restaurants (well price discrimination in general, but fast food is easiest to see). If you have the App, you can get that $5.59 big Mac with a free fry and drink. Without the app, the meal is probably close to $10. (Just a made up example, but in general app coupons seem to often save 30-50% over not using coupons).
