If you add an insignificant product to the end of the tail, it obviously increases the proportion of market share of the first X% of products. That's simple math!* If your model of the "long tail" completely fails in the simple case of adding a once-purchased product, maybe your model sucks and Chris Anderson's model was more useful. * Yeah, there's a small requirement of proportional market share of the Xth percentile product vs the insignificant one, but no need to nitpick that.

+1, Funny?

1. You keep using Baltar as your example.
2. Baltar is frakking insane!

I see you took the red pill.