Apparently not playing the game gains you more rubies and stuff than playing the game.
www.reddit.com
So if you don'y play the game for 15 days, You get a comeback mission set that give your.
4500 Rubies
120 Seasonal Rolls (3000 Diamonds)
90 Seasonal Battle Rolls (1350 Diamonds)
A lot of other stuff like Souls, Ship tickets gold, ect.
I only get about 3235 rubies in 15 day, 15 not diamond generating Noah character and battle rolls and in the best case scenarios, 10 diamond generating Noah character and battle rolls .
So yeah unless there's a major event going on (Like Tekken or Sam Sho level) its better to quit the game and come back in 15 days. Even when a major even is going on, you can usually still get all the stuff since you probably started your stoppage durring a nothing going on week and will be coming back mid event. Most events last over 14 days.