I've been looking over the sales from the Asset store and I have a few tidbits that I can share (without infringing on any authors' privacy that is):

Effects are by far the most popular category.
Regular downloads (full fee) outnumber apprentice (reduced fee).


When I originally posted this info to a test group, I got the feedback that it would be nice to see some data on all assets, not just paid ones.
As we progress, I'll try to get more info to pass along.

Cheers
M