User blog comment:Nameless Wikia contributer/Magic: Specialization or Generalization/@comment-26454558-20161219215211/@comment-4753851-20161219231952

That's why if you have the money and time, I think all mages should learn a few spells from each element. For tactical flexibility. Also, if you are out in the frontier it could be pretty helpful to have a fire spell in case someone's tin & flint get lost. And an Ice spell to create water.

Especially after Haruhiro's team collected their bounty after the orc raid. From what I can guess, mage spells are more expensive than regular skills since she knows less spells than Haruhiro has skills. But I'm doubting the 4 Shadow spells she learned cost more than a gold piece. And if the spell tiers are the same across the board than all she would need is 3 gold pieces to learn 3-4 spells each in Fire, Ice, and Lightning.