Would just like to add my thoughts , about the same as tabetha's , as someone who like tabetha has been in the motor trade , and racing , who now lectures in motorsport engineering and is no youngster at 43 , Camber or at least excessive camber will not eat the inside edge , it will wear the tyre more on the inside than outside but only half as much in the centre , you can ussually tell excessive camber to excessive toe as with toe the tyre , as tabetha says , is scrubbed across the road surface and so 99% of the time will show "feathered" tread edges , with excessive camber the tyre has no feathering .
I would always do a full 4 wheel alignment including castor and camber to check for any issues , as even an incorrect amount of caster can cause the car to feel unstable as one wheel has more self centreing effect than the other and can cause the camber chasing action to take place .