Why is a 2007 S George Washington Proof Dollar in PF 70 Ultra Cameo condition worth nearly as many points as a very rare 1937 MS 68 FB Mercury Dime?

I still do not understand the NGC point system for U.S. coins. It is clearly not based on rarity. Case in point I have a very nice and very common 2007 S George Washington dollar in PF 70 Ultra Cameo condition. NGC has certified at least 9,982 coins at this level and gives them all 908 points.

I also have very nice and very rare 1937 MS 68 FB Mercury dime. NGC has certified a grand total of 3,760 of these 1937 dimes. NGC has graded exactly 15 in this lofty MS 68 FB condition and none finer. This coins earns 925 points.

In my humble opinion the 2007 S George Washington dollar in PF 70 Ultra Cameo condition should be worth about 50 points. The 1937 MS 68 FB Mercury dime should be worth above 2,000 points. What do you think?

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