Mana spring totem has inverse scaling, what's with that?

[magwo]

With scaling I meant that its mana cost becomes a lower percentage of your total mana pool as you get better gear, I should have been more clear.

While this is true it's such a cheap totem that I wasn't too concerned about its mana cost, but.. yeah I guess that's true, even though its mana cost is almost neglectable and thus limited in how much it can "scale".