paying doesnt get much more cultivation runes maybe 10k in total. but once u hit cap lvl u start o stack them up faster than you c*e them and if ur at cap for a while u end up with huge amounts left over.

plus because we lvl slower and slower we get more per lvl and can stack more up b4 our ninjas need them again.

while u need them try to make the minimum amount of teams possible until u have enough to spend on more ninjas, i have over 24 ninjas fully cultivated and still have over 100k runes im not using, but that didnt happen all at once, i started with only 4 then 8 then 12 and kept slowly adding more when i had the resources for it