With toe, you are essentially dragging the tire over the pavement while rolling, therefore increase wear. Camber you are rolling on the edge more, but not dragging.
For a street car, you don't want any more than 1/16th total toe between the two sides (I think it is that, might be 1/32nd total). Where as camber, you can go up to -2 or -3 with no toe and your tires won't wear to badly.
Tire inflation also plays a factor (over-inflated means center of tire wears faster, underinflated means the sides of the tire wear faster).
So if you have poor inflation, lots of toe and camber, you can really destroy your tires. The OPs don't THAT bad, just enough bad that the toe was probably incorrect.
Quote:
Originally Posted by Year's_End
Negative camber. Excessive toe-in/out would just increase general tire wear.
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This would only be true if there was 0 camber and the tire was sitting flat at all times while driving. Likely there was a little negative camber (okay) and too much toe, therefore the inside of the tire sees the damage from the toe.