Just to chime in on the parent/child thang...

I've done maybe 50 WP sites (including staging sites - so is that a +2?) and not a single one is up without a child theme.

So pointless to count my child themes as it would only amount to 25 (or 50?) individual active installs. Much more sense to count just the parent themes (maybe just five that I've worked with.

But what happens about the bare bones framework themes? Many of the themes here are children of these. But, I suppose, the vote should go to the 'published' theme, which would be covered anyway. And downloads of the frameworks will no longer skew the results, so that is better :)

OK, ramble over,,,