I might have missed something in reading, but I don't see a cost for channeling. My guess is 1 point of focus = 1 spell level, not sure though.
They have max of 10 focus points at 20th level.
Not many spells off of base focus points, but as long as you don't want to do any moving and cast a spell that takes a standard action you can get 2 points back every round. You can also absorb ...



