I actually tend to avoid the random girls. There are two types of randoms:
1. Actuall girl that should be a unique (Mikan, Yami/Eve, Kallen)
2. Random pics of a specific type (schoolgirl, teacher, elf, etc.)
For type 1, I would want 1 copy, preferably as a unique girl.
For type 2, the fact that every time I click the girl her pic changes appearance significantly, just breaks the immersion, the uniqueness of the girl. I can't be bothered to pay attention to her so why have many multiples.
I think it would be better if so-called "randoms" were really just "generic" girls. 3D custom shoujo while a nice poser may not be the best art style for the game. If you weren't to worried about ip-protection policies, you could try using games like CRF (Custom Reido Fantasy) to create individual girls, save a few pics for the different acts and create "generic" girls picks. You could easily get 20 girls that way and with randomized traits, may be worth having---well for me at least.
Hmmm.... I might just try this, assuming the next beta version is not too far out.