Quote Originally Posted by Unregistered View Post
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Now affection costs formula:

1 star = number of girls * [ 15 (affection points) * 417 (shop price) + 3150 (upgrade cost) ]
2 star = number of girls * [ 50 (affection points) * 417 (shop price) + 6750 (upgrade cost) ]
3 star = number of girls * [ 150 (affection points) * 417 (shop price) + 18000 (upgrade cost) ]

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This seems like the most accurate calculation out there.
But I had to use "number of girls +1".