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Drop Rate?
I think what Nadindel is asking is that if having more party members will decrease the amount of dungeon runs needed to find the book since having a party of 8 would be similar to doing 8 solo runs (?) but in a much shorter period of time, therefore being more efficient.
Ex1. Dungeon Chest Item Drop Rate 10% * 8 Party Members = 10~80% chance of it dropping in general (10% individually)
Ex2. Dungeon Chest Item Drop Rate 10% / 8 Party Members = 1.23% chance individually
I don't even know if any of my examples are correct or make sense but maybe it would be a good idea to make an full example to help demonstrate what you're trying to say.