Oh very simple, the bonus from summoning, the REAL bonus is visible when you hover over the "Soul Bond" buff that the summon gets when you raise it.
For example at 10 summoning it grants +100% dmg,life etc, as it says on the buff (or if you examine the summon with a character)
However normally it should have +50% instead of +100% at 10 summoning. This difference REALLY gets crazy as you put more and more points there.
Self cast simply cant keep up.
