Do you work for Best Buy or something because it sounds like you are passionate about their rules and exceptions they make for customers.
No but I am "passionate" about helping people and trying to prevent confusing information from being spread and making it harder on new people who are unfamiliar with ANY website/store/loyalty programs terms and conditions.
Here is the sequence of events since your first post:
1. You said it works, I assumed this was a joke. But I wanted to make sure the OP knew so they weren't confused.
2. You said you were dead serious that it worked this way. But I know this is not true. I have been a Gamers Club paid member soon after Best Buy started the program years ago when it was a magazine and $15 a year.
3. You said it has worked many times for you in the past. At this point I thought you were misunderstanding the original question and did not realize they were talking about buying multiplies of the same game. But you were thinking multiple unique eligible titles. Such as a single copy of Madden, Battleborn, MGS5, Disney Infinity 3.0, etc etc.
4. You then said they may have made an exception for you. Which leads me to believe that you never automatically got 2x $10 but had to call to get the 2nd one added to your account. The systems are 100% automated so there are no exceptions with that type of system. Exceptions are done on a case by case basis by an employee manually.
Again you said you were mistaken and that's fine and everything, I just want the OP to understand that it has always been this way and anyone who has an experience counter to that is the exception and not the rule regardless of the way that exception has occurred.