Worn out frets can make an otherwise great guitar a pitiful thing. Fret buzz, rattle, intonation problems, hair loss (maybe not hair loss) can all result from badly worn frets. The 'before' photo above shows badly worn frets. This guitar had been played so much that the first 12 frets all had grooves like those shown here, and the guitar was pretty much unplayable.
I'd guess everyone has run into those little white pouches of silica gel. They are included in the shipping materials with electronics and anything else that could be damaged by too much humidity. This is especially true if the item has been shipped across the ocean, such as, say, guitars and other wood instruments.