The reasoning is more specifically because of the SEO value in terms of trying to combat the Florida ranking system: theoretically, directory pages
could be classed as "expert pages". The list above is specifically to address that issue. Maybe I should be clearer on that?
As part of a general marketing drive, though, submitting to free directories that are otherwise not indexed will likely have its benefits. I should probably draw up a second list of other free directories, for this purpose.