How have major crossover events in superhero comics, such as Marvel's "Infinity Gauntlet" or DC's "Crisis on Infinite Earths," impacted their respective universes and readership?

How have major crossover events in superhero comics, such as Marvel's "Infinity Gauntlet" or DC's "Crisis on Infinite Earths," impacted their respective universes and readership?
Admin 9 hours, 59 minutes ago in Comics
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