[quote name='SpitFire158']You can't give Feedback for something that is given for free[/quote]
You are right in this case, but that's not true. If you give someone something for free, and he pays you for shipping, then you exchange feedback. However, if I were to buy an Xbox Live code, like I did earlier, nothing physical actually exchanged hands, so no feedback is given. (At least that's how I interpreted the rules.)