I think the thing is digital comics remain up on their store to buy forever. Physical copies of comics are only printed in limited numbers and then they don't send any more off to the comic stores. So it's easier for them to keep track of how many physical copies are sold.
I mean people can right now buy digital IDW comics that came out way back in 2011-2012, should those be added to the overall sales of those individual issues even though they're 4 years old now?
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