There are cost for what ever product company is selling...thats why they have to price them as well.
To be easily available for all the streams starting from low-mid-high....they have manufacturing cost,transporting cost, whole seller etc costs are attached to it.
TO survive in the market company has to keep these factors in mind and also the end use. SO that their price will not effect the consumer...they have to use the material what ever is required.
U might have seen that all those high end motherboards come with copper heat sinks....they do have cost attached to the system and they are supposed to be peak overclocker and extreme out performer!