Not making a statement or taking a stand, just throwing a question out for discussion.
Take it as a given that a player is not spending money on the game, and not spending endless hours/day playing and silver farming. Silver, therefore, needs to be rationed cautiously. (Players who routinely run for Dad's credit card won't have to worry about the rest of this post.)
What is the advantage of leveling a hero past Level 9 except for opening up more chip slots, and earning PVP bonuses? Seems I have better things to spend my silver on than the truly awesome amounts it takes to get to the last three levels.
I'll note that I may be exposing a great swath of ignorance on my part. If so, don't hesitate to let me know. I'll have learned something.