I don't see the issue. If you paid for the commanders already, not only have you had all the time previous to War Spoils to enjoy them while nobody else could get them, you are also now able to use them 100% of the time guaranteed with no limits while everyone else and their wife need to wait for the potential lottery or a free weekend. It's the same as having it in War Spoils now or being able to buy it, you basically pay for the ability to guarantee it's use forever with no limitations.
At the same time, the items I purchased does not increase my ability to receive newer content. I will receive duplicates to the very items I already paid. In essence, I have a far greater chance in receiving duplicates, thus being a handicap for obtaining premium content via War Spoils. Is that fair?