Seriously? A subject line with such a trivial change makes that much of a difference? It's the same email. A "please remember to buy from us while we cash in

Seriously? A subject line with such a trivial change makes that much of a difference? It's the same email. A "please remember to buy from us while we cash in on the commercialization of the holiday" email from a retailer. I'm surprised to find out that people are actually influenced by that slight change in subject header.