In general, I wouldn't classify these questions as "too localized". My understanding of the term that it applies to questions where the answer would be of interest/valid for a set period of time, usually one short in length (e.g. "When is the Zenga IPO?" would be too localized, becuse after Friday, no one would care). Price movements that are particularly sharp or seemingly counter-intuitive are of historical interest and don't necessarily have a shelf life. Not every such question is going to be like that, of course, but many will.
I do agree, though, that these questions may not be suitable for this site, as I supsect that, more often than not,they generally would be fundamentally unanswerable. The best one could honestly answer would be"The drop/rise was generally attributed to ..."
A blanket ban on these type of questions may be going too far, but at the same time, trying to specify acceptable forms of this question would be difficult. Further discussion towards whether we should accept these questions seems to be needed.