This isn't saying anything that Tyrian didn't already say. It's nothing more than a "me too!" post.
We also have to take in account replenishment and mana regen. If you interscale Free Scorches between FB, you can launch more FB before OOM. Maybe you will have Evoc or Mana gem up again before having to Scorches spam because you have no mana.
I can add that being OOM means that you can't launch awesome Pyroblast!