Originally Posted by Unregistered

it is worth to use ten of 1 star manyu and 40000 coin on a level 40-50 girl just for that 2-4 levels?

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It depends. Have you reached the point where you're no longer worried about gold and always worried about character inventory space?

I am pretty much at the same spot only time I wouldn't do it is if you know that you have some evolution to do which absorb a good chunk of gold.
I just had 1 mil gold not long ago then i had 5 evolutions to do in which im back around 250k while still being reckless with gold.