In a lot of places, rotisserie chicken are a loss-leader - they are sold below cost in order to entice more shoppers in the hopes that they will buy enough other things to more than make up for it.

Costco does this, not only on their hotdogs but also on their chickens also.

A lot of other times, raw commodity materials are more valuable than finished goods because of the implied value; ie there is an opportunity cost associated with transforming it into a finished good.