Many thanks for pointing that out, guys. It's always good to know one isn't mentally unbalanced.
Now, imagine someone applying a magical focus to a 20 in both the goetic ability and the "mundane" ability (Artes Liberales?) required... With Cthonic Magic on top... You don't quite get the "inherently evil" and "grossly powerfull" thingie
And yes, Gareth is right, Summoning can be magical (albeit tainted!), there's even an exemple of a Summoner with the magical version (a re-take of an old hedge magic character).