I disagree - we have way too many dodgy images as it stands. I've asked for another SQL query to find out what percentage of our images are untagged and what percentage are tagged as non-free.
The time in adding images is in preparing them for publication (cropping etc) and adding them to articles.
Special:Unusedimages says that we have 26,121 unused images. I am aware than mediawiki 1.3 has a problem in this area but we don't have a grip on image use at the moment.
http://en.wikipedia.org/w/wiki.phtml?title=Special:Unusedimages&limit=50...
Caroline