They are cheaper and they do exactly the same job. We sell a 700mm black base cone which is perfect for carparks and driveways. It's light enough to carry around but not too light to be blown away in the wind like the 450mm high cones. At 3kg and 700mm its the perfect for carpark/warehouse/service stations use.
In times gone past we would sell a 900mm cone to someone who wanted to cone off their container for example and they would gulp when we quoted $30 for a cone. Now you can get a cone that does exactly what you need for about half the price.
Also I would strongly recommend only buying the PVC cones - the PE cone is lighter and brittle. It can only take one impact before its destroyed. If you are worried about the weight because you are in windy environment there are heavier options like the T-Top Bollards which way 7kg and 9kg which could handle the wild winds of the west coast of New Zealand.