Only thing I have to say about this is coffee/tea/muffin deal from McDonalds is amazing. $2.25 is a great deal.
If I ate at home, I'd have to make an egg, toast, make tea (total cost, around $1-$1.50) then deal with all the mess either in the morning or once I get home. Nothin starts my day like getting a tea and muffin from mcdicks
I'll gladly spend the 75c to save all that hassle.
On the other hand, if you are getting bacon and eggers and what not, yea, $6.50 for breakfast is not a good deal. And I do still try to make breakfast at home, $1/day saved is $365 per year. That almost pays for liability coverage on a single car.