This is the kind of game that you play as much or as little as you want. If players are letting the game get in the way of real life then that's their problem not Gree's.
The community has been asking for new content in CC for a long time and now that it's finally arrived you're moaning about it because it's too much.
All the players that are feeling burnt out need to take a step back and maybe some time management classes.
I know how much I want to play this game therefore every time an event gets released I weigh up the value of the prize against how much time is needed to get it. If its worth investing the time and money then ill go for it, if its not worth it then I play the event as and when I can be bothered. The only exception to this is the syndicate main event because I'm part of a team and feel that I should be contributing as much as possible towards my team.
One main event every 3 weeks is about right. I think once a month would please more players but at the end of the day it's all down to the player and how much they want to play.
When KA got released I knew I didn't have the time to maintain 2 KA accounts as well as 2 CC and 2 MW accounts so I passed on playing that game, a decision I'm very happy I made.
Then MQ got released and I decided to give that one a go because CC was really beginning to bore me but after spending hundreds of pounds on MQ I now only log in once or twice a day to collect and upgrade. Looking back it was a bad decision to start playing that game but I've got over it.
At the end of the day it's down to the player how much you let these games rule your life. If this virtual world is getting in the way of the real world then you have serious issues and I suggest you seek help immediately.
Gree are merely providing a game for you to play, how addicted you become to that game is your fault not theirs.