Should rewards be based on the ship class types sunk and not just because you happen to be in a higher tier ship? That is to say, sinking certain ships and higher tiers would yield slightly higher rewards. Also a T3 DD dealing much damage and sinking would give much higher reward than if a T8 BB sinking a T3 DD would. With the way the system is now, if rooms were reintroduced again a higher tier could just pop into a low tier room and farm the lower tiers with little resistance.