I would guess that the median New Yorker staff writer gets more like $150-200k, all in (when you add up magazine fees + book advances + speaking fees.) The mean is much higher, because a handful of outliers (heh, Gladwell) make $1 million plus.

There's a power law distribution, as usual, but it's not very much. IIRC, it generally maxes out $80-$120K, with a select few making more.