Ranked is less of an issue, at least there is always the stamina pot so there is "something" to buy. If your points are piling up, it's due to your choice.
Survival thou....
food is flat out useless
I have 400k+ cult rune piled up while upkeeping full cult on over 20 ninjas, so I really don't need more
all ninjas are 5*
It needs SOMETHING. it doesn't have to be whatever the CN server have, there just have to be something useful. Even if new ninja is released and cost 2k per exchange, at this point I've saved enough that I won't run out until a month later, at which point I'd complete it....