I can’t imagine a reward that increases as you go lower in the tiers. Maybe it’s a placeholder for whatever extra compensation they have planned for the season?
could just be a placeholder so that it's visible what AW tier you were in. for example the top alliances would get 1 MS_NULL item, gold 1 gets 10, gold 2 gets 11, so on and so forth. so then when war compensation based on tier goes out, it's easy to figure out which tier you were in