Question about silver proof sets

If there is supposedly no "clad" coinage in silver proof sets, then why are there copper coated zinc cents? Why not mint the cents the way they were pre-1982? Wouldn't this make more "cents"
in keeping with the theme of a non-clad proof set? I can't imagine cost of copper metal would have anything to do with it since silver is more expensive, right? Just a thought...
But I guess one could go one step further and question why not mint the Sacagawea out of gold or something...

But I guess one could go one step further and question why not mint the Sacagawea out of gold or something...
Always looking for attractive rim toned Morgan and Peace dollars in PCGS or (older) ANA/ANACS holders!
"Bongo hurtles along the rain soaked highway of life on underinflated bald retread tires."
~Wayne
"Bongo hurtles along the rain soaked highway of life on underinflated bald retread tires."
~Wayne
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Hope this helps.
Jody
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