Will I get paid for overtime? vitalex kft The most common grey charge occurs when you sign up for a product or service you think is free, but after an initial grace period you start getting charged for it. For example, if you sign up for a 2-week free trial of a weight loss program but forget to send back the workout DVDs or cancel the service, you could be charged the full price of the item or an ongoing monthly fee. These "free-to-paid" fees represent nearly half of all grey charges, Aite found.