Why you're still not bringing a reusable mug for your daily coffee

What would you do to save a few pennies? Thirty to 45 percent of shoppers will remember their reusable grocery bags to save on a five-cent bag tax. Consumers will wash out and return 70 to 80 percent of recyclable bottles to cash in on bottle bill refunds. But fewer than two percent of coffee lovers will bring their own mugs to Starbucks to save a dime on their beverage. Why do people work hard to save on their bags and bottles but not on their cups of joe?