The Damage per Gold stat

On the surface, it seems like it's good if this stat is higher, because it suggests to me that you're contributing more to kills and stuff. But when i looked at my stats I noticed that the damage per gold stat was higher among low tier players than challenger players.

So should I consider this stat to be better the lower it is? I guess a lower damage per gold stat means you're being more efficient on income, ending more killing sprees and doing less damage to lane minions while still getting the last hits.