oh ya its not really good to have all zero camber but its ok to have CLOSE to zero
the reason for that is beacuse if your drifting especially abs or pvc and have zero camber then your car will not be able to drift as long as a car with negative camber also beacuse of side wall hitting the ground (bumpes, rocks, and cracks in the floor)
but now your thinking the pvc or abs wears out to the floor so that the WHOLE tire is touching the floor... but you also have to think about chassis role,shock and spring compression and also rebound
not to be mean but just telling you what i know from my experience