I'm sorry you missed our announcements - we did send an e-mail to everyone who donated $23 USD or more, inviting them to our community voting platform. We tweeted and blogged, it was mentioned on Facebook... we used all the channels we have and overall I've been very happy with community response.
There will be other votes in the future, so please follow us on Twitter or subscribe to our blog's RSS if you're interested. And thank you for your support! :-)
Regarding the election; as I mentioned in the post, I have been following the ratios since elections started. The ratios have been pretty stable the whole time; for every Apache vote there were roughly 1.05 AGPLv3 votes... I think it's unlikely that better outreach would have changed things. A broader and more lively debate might have, but given our limited resources we weren't able to stoke that particular fire any more than we did.
Out of curiosity, what is the percentage of all of your donors who donated $23 USD or more (and, thus, received the e-mail invitation)?
I'm simply curious if there's a correlation between the two.
That said, 16.5% voting participation is a bit on the low end. My guess is that it mostly reflect those who reads the Mailpile blog, are active in the development, or are active in places like HN/conferences where news about the vote has been announced several times.