I also realized that the CHARGES are much more of fun - like mini in-game, where you have to get the charges before the enemy "takes" them (they dissapear when enemy steps on them.
Also- Should I attack/use ability? Or rather collect the spheres. (And I realize how much fun it is to choose collecting spheres, prolonging the battle also risking that enemy will use my greed against me via vicious counter-strike)
Mostly I even don't need so desperately the ammount of mana/rage, but I need the fun of collecting the spheres
... when I count in the random chests... each battle is much funnier