At the rate of these "events," at the massive level of inflation in player scores and income, Gree is sowing its own seeds of destruction and there's really nothing they can do about it now.
I can understand Gree's desire to churn out these things as much as possible as each event is a catalyst for real cash for them, but it carries with it a systemic danger as it creates a huge rift that is impossible to overcome for newer players.
At this point, most factions are stealing players from each other, or merging. It's a self-defeating cycle that shrinks the amount of factions involved in these events. Newer, low level players stand no chance of being able to participate at an even half-decent level and they will NEVER be able to catch up as the ceiling is always rising. I'll say that again, the ceiling is always rising.
The amount of newer players being pulled up into factions is far less than the amount players being shifted down or completely out. It's unsustainable. I see it happening now. Gree needs a new strategy, one that keeps us old players engaged, but at the same time doesn't alienate newer players.