On the guide it says the reward "Varies $5,000 to $10,000" but in actuality the upper limit of the reward is $20,000.
Added (2011-12-01, 2:38 PM)
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Also! The MadamPortsMouth's Encyclopedia quest is listed as beginning "Mrs Penman, Penman Family Home, PlainTon." However the quest starts by speaking with MadamPortsMouth at the Angled Forest Isle dock house.Added (2011-12-07, 12:50 PM)
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Another addendum, in "The LongStory Clan Carving Contest" the reward varies based on whose carving you choose. I received 5 tanzanites, and not diamonds, for my choice.