They almost certainly get more money.

They are selling the budget chickens to the budget customers at a profit. They are getting the same chickens at a larger profit to other people.

Think of it this way: a rich man is willing to pay up to $10.00 for the chicken breast that his family needs for dinner, but his blue-collar cousin can only afford $6.00 at the most. Had the grocery store only created one line with the price of $8.00, their revenue from these two consumers would be only the rich man's sale, 8 dollars. If, on the other hand, the store had two lines, one for $5 and one for $10, they can make 15 dollars from these two shoppers!

Hope that clears it up.