How come circulated Barber Halves are PCGS sheet price static

When in reality ,the keys and nice F-XF seem to be very hot
and if nice and original, sell well over sheet prices?
and if nice and original, sell well over sheet prices?
There once was a place called
Camelot
Camelot

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Prices are still well below what the real fanatics are paying for original pieces, but with all due respect to Mr. Bear, I would not call them 'sheet price static'. They are among the few series on the sheets showing signs of life.
Camelot
<< <i>The PCGS Price sheet don't show nothing though? >>
I just completed my VF Half set today.
The PCGS price guide was about as helpful as a rutabaga in judging market pricing for these coins.