Initiated by xport's latest question, I've gathered some statistics about xport's questions from July 1st up to today (July 24th).
In those 24 days, xport has asked 57 questions, i.e. about 2.4 questions per day and about 7.9% of all questions asked at tex.sx (724).
Those 57 questions at the moment feature an upvote/downvote total of 118, i.e. about 2.1 votes per question. 13 questions (22.8%) have a score of zero.
At stackoverflow.com, a limit of 50 questions per month was enacted in April 2011. One rationale for this limit was that every question draws time and attention from other users, and no one should be allowed to overstrain the willingness of others to help. Another reasoning was "If you are asking over 2 questions per day, there is a good chance you aren't putting enough time into your questions."
At the moment, the limit is "only active on the trilogy sites" (stackoverflow, serverfault, superuser). In my opinion, tex.sx would be better of too if everyone was induced to spend a non-trivial amount of time trying to solve questions by himself/herself, and to ask only those questions where he/she couldn't come up with a solution.
So: Should SO's "50 questions per month" limit be enabled at tex.sx?