Why is the grey sheet so far off market prices on bust coinage?

Any others you think they are way off on?
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Comments
The listed price, is for generally fugly coins for the posted grade.
For spectacular, unmessed with coins in AU you will generally have
to pay BU 60 - 62 money for. The tiers in this series large. Legend
is offering 475 and more for all AU -58 PCGS Half Dollars CBH. The series
has increased perhaps 50% in actual value over the past 2-3 years and
it is getting very expensive to put a nice set together in high grade. The
CBH was the workhorse of money in its day and most of the halves are
pretty worn out. As the popularity of this interesting and beautiful series
increases, prices for the Creme de LaCreme Coins that are almost 200 years
old is bound to continue its increases. We have a similar situation with
the Barber Half Dollars. Nice untampered with VF-30 to XF-45 specemins are
underpriced on the sheets and are getting very hard to find. Most have been stripped,
or are badly scratched, wiped, dinged on the edge or have a fugly unatural color.
Camelot
Liberty: Parent of Science & Industry
But the PCGS price guides come a lot closer to what is being paid for many of the dates, especially CBH's.
PCGS 64's and 65's that are nice will run just a little under this price guide's numbers, and AU 58's will bring up to 62 money. As long as you know the actual market, the guides are only fair estimates of relative value between grades.
But, coins in NGC slabs still trail, in the MS or better catagories. For AU 50 and below, the difference is not as great.
The question is why? Remember, these are only guides. Be it because of fair to poor for grade, lack of originality, grease stains, etc., there will be lower numbers on grey sheet, and CDN than in the market place for pq coins.