[coldtea]

He speaks generally, not absolutely.

You can see all between price points, but not all have equal peaks -- it's a larger "cheapo" and a smaller but significant "expensivo" segment that dominate, that's the author's point (whether it's true or not).

He doesn't say that there are absolutely no cases that fall in between, just that the distribution of them is not normal, but bifurcated to those two extremes.