bjbear...your response is typical of what I get from those that feel otherwise. The issue centers around the quality of the tires being made today and again the weights required on the better tires are minimal to the point of not being needed.
The closer to center that weights are applied the more weight is needed to correct a unbalanced tire/wheel. It doesn't make a difference as to the placement of weights on the inside or outside unless the dish is to the extreme.
Unsprung weight is critical...on a high performance vehicle the wheel and tire weight can be as little as 25 to 30lbs...higher speeds/revolutions contribute to a higher rebound rate if a unbalanced condition exists. But again were dealing with weight corrections on these tires and wheels as little as 1/4 to 1/2 ounce. When we are dealing with those vehicles that are not in the high performance class the issue changes dramatically, with tire and wheel combinations in the range of 70 to well over 100lbs in combination with a well sprung vehicle and a weight a correction of 2 to 3oz and minimal rebound is not felt nor does it show up in uneven tire wear.