Spoiled Rotten

Wow what a great deal 9lbs of Christmas oranges for 5 bucks! Every year that goes through my head and every year I buy one of those boxes. Every year at least half of the freaking box is rotten.
Do they line the bottom half with the rotten ones then a nice layer of fresh ones on the top so when you open the box you don't see the bad ones? Is this how they can make a profit at 50 cents a pound?