Higher grades always mean higher value; rarity can be more important.
Cleaning a coin improves its value; it often reduces it.
Professional grading is infallible; grading can be subjective.
Mint state coins are flawless; they may have minor flaws.
Original patina lowers value; some patinas can increase value.
Only rare coins need grading; common coins can also be valuable.
Grading is solely about appearance; historical context matters.
Grade alone determines worth; market demand is also crucial.
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