Sales: truth in weight?

I see many listings for the same item and weight can go from an actual weight to insane numbers up to triple its actual spec. Do you feel some abuse this estimate in an effort to profit and if so do you call out sellers on this?
I made a purchase once and the shipping quote the seller gave me from their own weight estimate was almost three times its actual value so I asked for the item to be re-calculated. The seller was gracious and all was fine but do many buyers accept what the seller tells them, and if you do when item comes have you ever noticed the item is way off from what you were told?
Should part of a sellers integrity include an honest estimate of weight (knowing that actual double boxing and protective packing can add a bit to the total)? I am mainly talking about items such as Music disc's, CD players, amps and items that typically dont have super high weight and should be fairly easy to estimate accurately.