In my answer to Should we require minimum reputation to continue
asking questions? I came up with a possible solution.  The
essential problem is that some people come to SO, ask lots of
lame questions, and never give anything back. The proposals have
included only allowing a certain fraction of one's rep to come
from questions and only allowing users to ask questions if they
have a certain amount of rep, but neither of those seemed
particularly popular.  This suggestion is:  Require that
unqualified users have their questions reviewed like edits
before being posted.  What is the qualification? It could be rep
that's a certain multiple of their questions (say 10 rep per
question) or a certain ratio of questions to answers, or some
other criteria. We could also allow a certain number of
questions to not require review (say, 5-10) so that a user would
have to lose their ability to ask unreviewed questions rather
than have to earn it.  Who reviews these questions? It could be
5k, 10k, 20k users, or maybe anybody