On the graph is looks like top 50 is where it started moving from "under 10" downloads to hitting the "exponential" part of the curve. But yes, I imagine that

On the graph is looks like top 50 is where it started moving from "under 10" downloads to hitting the "exponential" part of the curve. But yes, I imagine that top 25 would show a similar jump, and top 10 even more so, as the top 10 in category list is what shows on the "Top Paid" list on iTunes.