Well I suspect the idea is most people buy things before Christmas, not during. The perception seems to be that the single largest online shopping day in the "before Christmas" season is this "Cyber Monday".
Maybe the most active shopping day is the second Tuesday of December, or something else relatively obscure, but since theatrics are valued it would still make sense to hit on the day most people think of as "the big day".
Maybe the most active shopping day is the second Tuesday of December, or something else relatively obscure, but since theatrics are valued it would still make sense to hit on the day most people think of as "the big day".