We already came to the conclusion that they are losing money off the sales. I guess they decided to make it obvious!
Noone said not.
I don't think there was a time when I went to get just the specials, since I was going there anyways ended up making an entire grocery shopping out of the trip.
When's the last time you saw them advertised in the paper or any other place?
"That costs money".
The way of advertising which bingo seems to be doing is word-of-mouth which is a lot better in a way then on a paper which has to be that so-and-so read that paper.
So they get a carton of eggs for 50-$0.60 and giving 6 per customer so $3 per person.
If every customer is going to do the whole shopping or at least half a shopping it's worth for them to give you a $3 coupon for groceries you purchased.