I have asked myself the same question! I recently purchased a LCD3 w/ "less then 10 hours" on them. And I am absolutely loving them! While I can't confirm the validity of the usage, I assume now that issuing that statement "less then 10 hours" also means "these are in great condition...I may have used them for 500 hours...but you would not be able to tell."
Watching out for ear fungus....
Watching out for ear fungus....