As the author of this article does, I explain how Groupon and other daily deal sites work to anyone who mentions using them. Many people I've told feel somethin

As the author of this article does, I explain how Groupon and other daily deal sites work to anyone who mentions using them. Many people I've told feel something close to shame for using them — and stop. The people who don't are the last people in the world a business would want as customers.