Nope, no confusion here. I and a lot of my friends have camber from 0 to -3.5 on streetcars (which of course see the track quite often) and the cars with lots of negative camber wears the tires like the ones with less negative camber.
I also used to believe that camber ate the inside but not anymore.
BTW. Kinda hard to confuse camber and caster on the rear axle...
edit: spelling