"Groupon’s $3 was almost pure profit" Completely wrong. Just because Groupon doesn't have any variable cost doesn't mean all of their revenue is profit. Credit

"Groupon’s $3 was almost pure profit" Completely wrong. Just because Groupon doesn't have any variable cost doesn't mean all of their revenue is profit. Credit card processing, bank fees, and chargebacks will eat up 2-5% of the (gross) revenue, and Groupon spends much more than that buying clicks to drive traffic to the merchant's deal.