How important are the Speaker Cabinets?

I am curious to learn about speaker cabinet design and how important does the cabinet contribute to the overall sound. Does the weight of the cabinet make a difference. For instance a floor standing speaker that weighs 200 pound versus one that weighs 60 pounds or 300. Is there any correlation to weight and sound? How about material?

How much are you paying for the cabinet versus the drivers on an expensive pair of speakers?

Just curious?

Thanks.