Receipt Survey (scam or not)

Ok Many of us have looked at our receipts to check to see if we've gotten the exact change or if they gave us the right total, but how many of you have happened to look at the back or at the bottom of the receipt and have seen those little "tell us how we did" surveys. How many of you have done them? Well In my opinion I think no one ever does these things or even wins them, but, I want to make sure. So I have 3 receipts from different stores I've been to over the weekend (not saying their names), and I want to know if I will win or not and if I get any response from them. I will let you know the details when I get them most likely in two to three weeks.