Just because they offered it before doesn't mean they owe it to you now...
My job has employee appreciation days. Every year, they make it worse.
Offers change (usually for the worse unless the company is needs to drum up more business). Prices get more expensive. Sorry, but that's how it is.
You know the, "back in my day gum was only .25 cents?" Yep, you're going to find as you grow older you're going to reminisce about how things were cheaper and deals were better (apparently kids got real toys in the cracker jack boxes, like metal toys. We at least got plastic toys when I was a kid. Now I notice they only hand out pieces of paper with cheap puzzles or stickers).
so by your theory, in 50 years, when u get a happy meal, the cashier will just tell u a joke? your a moron