The reason for having the questions/answers automatically going into Comunity Wiki status, was to prevent people from editing Their question/answer just to bump the question to the first page.
The only thing is, it doesn't really solve the problem, you could just go edit someone else's answer, and it would bump the question up. Or add another answer to the page, perhaps with a dummy account, and have it edit it's own answer repeatedly.
I personally would prefer it not bumping, to it becoming a Community Wiki.
If anybody wants to know where this rule came from, it was discussed on podcast #20. I have included the relevant portion of the transcript.
Atwood: -
Somebody wrote a bot that would just
revise posts every minute to keep it
on the top of the stack. Actually
there is a certain amount of people
doing that still, which I'm trying to
discourage. They way I like to
discourage things is, where possible,
creating rules in the system that make
that behavior not desirable. Not
negative, necessarily, but things
happen that make it not worth much to
you.
So let me give you a specific
example in that scenario. You have the
user who's just editing their own
posts every three hours so that it's
always on the top of the stack. We
have this concept now, it's actually
implemented though I talked about it
in previous podcasts, of the community
owned post. Because one of the great
divides in StackOverflow is that we
have this ownership system where you
get voted up and down, your content
gets voted up and down, and that
affects your reputation. You own
stuff, so when you post something you
own it. Then you contrast that with
the Wikipedia model which is that
nobody seems to own it, and we're
trying to do both of those things.
At
the transition point we came up with a
couple rules. The initial rule I had
was that edits by four different
people will cause a post to switch
from being owned by Joel, for example,
to being owned by the community user.
At that point you don't lose any
reputation that you got up to that
point, but any future upvotes on that
content don't go to anybody they go to
the content. I think this is the way
it should be. Ultimately you're voting
on the content more than the person
anyway, so hopefully people are ok
with this.
Seeing that people kept
editing stuff over and over I bent the
rules a little bit and said ok, if you
edit your own thing more than N times
then it also becomes a community owned
post. There is no real value to the
user, in terms of getting additional
reputation, to bump stuff up to the
top of the stack anymore because if
you edit your own thing enough you
won't get any reputation from it. It
behooves you to only edit it once, or
however many times you need to edit it
but hopefully no more than once, and
just let it sit there and have people
find it organically and naturally the
way it is supposed to happen.