It depends on a subject, I think - not every field needs a doctor degree for experts But it's reasonable that your site is accomplished and already has at least some reference from other external sources. Otherwise, it's even possible to list some social network community or a blog in case its content is really worth it.
No SEO value, only HUGE traffic value. But getting a link to a popular wikipedia article is very difficult.
You get great direct traffic from wikipedia and no follow has no bearing on yahoo or msn - people use these search engines too!