Unethical to do what exactly? Only consume part of it? Is it unethical to ignore the coupons you get at a supermarket? (for people who haven't been to the US:

Unethical to do what exactly? Only consume part of it? Is it unethical to ignore the coupons you get at a supermarket? (for people who haven't been to the US: coupons are printed on the back of the receipt)