Avatars, little symbols that appear alongside your tank, and have no obvious impact to either game-play or functionality - so why are they frequently appearing in containers - surely this simply is a tactic for avoiding giving out something of more useful value - such as Crew XP, or Combat XP ?
It'd be interesting to see what others feel about them, and perhaps, if there's a significant trend of thought one way or another - we should present the results to WG (Ribble & Co...) asking them to consider the Communities wishes. (which maybe wishful thinking).