a physical CD has but one owner at a time. once it is purchased, it may be re-sold a few times before it dies, but most CDs on the planet have only had a few owners. so if you single out 10,000 people who have owned a particular album, you've got at least 7,000 original purchases, and probably more than that.
digital is completely different. a single CD can be purchased, then disseminated to 10,000 people who don't pay a dime for their copy.
see the difference?
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