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I'd say it's a tie between the unlimited money and max VA skills. It makes CG collecting that much easier imo lol

Max fame + max money and you never need to do anything again lol. Max VA skills is pointless if you have max fame because with max fame you don't need to take any auditions, you will automatically win the Seiyuu Award. So basically with max fame you can completely skip auditions and use your time to interact with your guy.

Max VA skills and Max money. Max fame is also good but there are some events during doing auditions, so I think doing audition is necessary. And it's why I think max fame is not useful.