Why does VF and AU have more recognized grading levels?

Why does the grade of Very Fine and Almost Uncirculated have more recognized grading levels than the other circulated grades? Very Fine consists of VF20, VF25, VF30 and VF35. Almost Uncirculated has AU50, AU53, AU55 and AU58. Extra fine only has two; XF40 and XF45. I can understand why AU has more recognized grading levels, because it is the bridge between circulated and uncirculated. Why doesn't the grade of XF have as many recognized grading levels as VF?
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I don't want nobody to shoot me in the foxhole."
Mary
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In the "old world" EF was a coin that had all of the detail sharp with just a brush of wear on the highest surfaces. There was virtually no mint luster or no mint luster on a EF-40 and a trace of it on an EF-45. An AU coin would have 50 to 75 percent of its mint luster. Sheldon had only two AU grades, 50 and 55. The others have been added later.
In general there has been a relaxation of grading standards. Many EF-40 coins are what VF-30 and 35 used to be. I've seen some Morgan Dollars in AU-50 holders that I would be hard pressed to call EF-40. All of these added grades provide sellers with opportunities get higher prices for the coins for tiny differences in preservation. Sometimes it's justified for really scarce coins; for common ones it's a waste of time IMO.
<< <i>FiveCents... you are really George Carlin, right?? >>
I wish.
BillJones......Great Point!
<< <i>They should really extend ef to include ef50 and ef53 and limit au to au55 and au58 IMO. Makes more sense. >>
BAJJERFAN..... Would that mean a tightening up on the grading standards?
The point difference on the grading scale between F15 and VF35 is 20 points, where as the grade difference is 10 points between VF35 and XF45. I guess according to the Sheldon grading there is twice as many grade variances in VF than Ef.
There's: Flamable, Inflamable, and Non-Inflamable.
How can there be three?
I see a lot of overgrading from the VF30 to the XF range and the XF range to the AU50 range. I wonder why anyone would want to grade a coin higher than it really is??
Tyler
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