I swear, I'm going to get a coronary before I win even 100 dollars.
I did win a free breakfast sandwich, but I've won those in past games too, I think it's just a common prize they throw in the contest to get people's hopes up that they'll win more. And they know most people don't eat McDees breakfast, so it gets more people eating breakfast food.
I used the free breakfast sandwich token to get Nuri's most hated sandwich, the McGriddle, which happens to be one of my favorites. I can't figure why she hates it so much.