Fireball vs. Pyroblast

Hey guys, I was looking at the mage spell cards and I noticed something interesting: There is absolutely no need for the Pyroblast spell.

Pyroblast is an 8 MC card which deals 9 damage to a single target. But for the same mana cost, you could cast 2 Fireballs in one turn for 12 damage.

Which makes me ask: What is the point of ever putting Pyroblast in your deck? You use almost all your mana in one turn to cast a spell that does significant damage, but could better be spent on other cards, like my Fireball example above. I feel like if they're going to have Pyro be double the cost of Fireball, it should do double the damage, or close to it, instead of 1.5x the damage. Either that, or lower the cost of Pyroblast to 6 MC.

What do you guys think?