Maybe the larger containers were not needed as they were never full? OR The sanitation dept. wanted to individualize the garbage picked up at each home. OR Maybe the workers get paid more for EACH container picked up? OR Maybe in the near future they will be going to smaller more efficient garbage trucks and all they can handle are the smaller containers. OR Maybe somebody has a relative that sells the smaller containers and a sale to the city for 1,000 of them was a really good deal?