i find it unreasonable for an object to have a lock in period. i mean, once you buy it its all yours imho, do whatever you want with it and no one will care. might void your warranty though.
think about it on something perishable, lets say a salad dressing with a stingy rule of you're only allowed to use it on salads. you used it on flavoring your french fries instead... the manufacturer sued you...