Camber (within reason) on it's own isn't a huge generator of tyre wear, but add significant toe to significant camber and the wear multiplies (i.e. camber X toe creates a lot more wear than toe or camber on their own).

You may get reasonable wear on both tyres even if you have unequal camber but with zero toe. However, if you have uneven camber as well as significant toe then the tyre with more camber will most probably wear a lot faster than the other tyre.