If you are using a good pluging or add on to your private area, then No your private content will not be crawled by the Search engines, thus there is no SEO value to Optimize these page.

you can check your pages that is crawled by Google using the "site:"

for ex: Go to google.com and type is the search: site:www.website.com and check if your private area is indexed.

here is a couple with a lil research:

• http://www.business-directory-uk.co.uk/sports.htm
• http://www.mysoccerlinks.com/
• http://www.londonmmxiiolympics.com/
• http://www.golfshack.net/

Cheers

there is alot of good directories, please put in mind the more relevancy of the directory to more valuale it is for you

here is a couple:

• www.dirjournal.com
• Yahoo Directory
• Canny Link
• JoeAnt.com
• Ezilon
• Jayde
• Skaffe
• BOTW
• Aviva Directory