Goldfish introductions

When I started reading multiple articles by the same person on similar topics, I got sick of the same introductions, but I understand now that there's a minimal amount of information that has to be provided each and every time you write or present so that people who haven't read or seen any of your stuff will get that introduction. At the same time, though, the question suggests itself: who is more likely to read your article? Brand-newbies or people following your work? I honestly don't know that and it would require a fair bit of research to find that out.Might be interesting though and might change the way we structure articles... but probably not.