The existence of the 50 questions/month limit is good, as much as I don't like it. It prevents people like me from asking too many questions. :-)
However, a couple of suggestions on improving it:
It would be great to have a warning or two sometime before it all ends (say, if we only have 5 questions left), so that we're not suddenly caught off-guard.
It would be great to know which 30-day period it's referring to, since it doesn't look like it's the last 30 days (though I may be mistaken). When we can start asking questions again—do I have to wait 1 day or 30 days?
Make it be the last 30 days, not "last month". That way, people will know that they can ask at least 1 question tomorrow.