Following a thread on alt.internet.search-engines (database-driven varying content of title and alt tags) and despite 10 posts so far, no one has answered the question!

Times for a short article on Does Google Prefer Fresh Content?

Main thrust of the original posters question regarding generating fresh content.

My question was how much better might the search results be if the content of my title, alt and header tags vary at random with every (most) visits, all containing appropriate keywords and content.

This poster has obviously been reading various forums, websites etc… that state as an SEO fact that Google prefers fresh content.