You'd have thought that our current policy list at "What Wikipedia is Not" is clear enough on the matter of any old person off the street adding an article about themselves to Wikipedia: self-published authors, new prophets, and so on.
But with rising awareness of WP, this will be an increasing problem. See for example, http://en.wikipedia.org/wiki/Talk:M.R.M._Parrott
On VFD he author argues that nothing in our policy forbids a biography of him, even though we've found only two reviews of his books. As well as being what we call "non-encyclopedic", these can't be NPOV since the facts can't be verified.
Should we write a specific policy page about this, to expand the entry on WWisNot, in a similar way to what I did recently for http://en.wikipedia.org/wiki/Wikipedia:No_original_research ?