It has been a general concensus on main meta that "hi","thanks" and salutations should be edited from posts.
Should we do the same here?
In general, salutations will tend to be removed, as this is something that has been discussed in a few places, Meta.SO being one of them.
One of the Meta.SO posts sums it up well, saying that:
If this is supposed to be a website which is servicing more than just the primary author, we need to think about how we construct messages so that they appear more clearly to those searching on google for questions that match their own. If I am looking for a solution for question X, I want to find someone who had the same problem, not their short autobiography and formalities before getting to that actual question.
There are also scripts on Stack Overflow that actually remove such things from questions and so on at the time of submission, but it looks to be only implemented there, if it still is.
It is important to remember, though, that while you are editing out salutations and other related things from posts, check the rest of the post. Is there anything else you could edit to make it better? Fix tags, or edit for grammar or spelling or clarity or any other thing you can think of. :)
If that is the only edit to be made then generally no. Edits should improve the question, the removal of hi, thanks, etc from a question by itself really does not really do that. If you are going to edit there are generally other edits that should be made to a question. Fix spelling/grammar errors, add/remove tags, fix wording to be more readable, clarify a title, etc. If you are in editing for those thing then yes remove the extraneous bits.
If those bits do detract from the question, ie "Hi Sucka's", or something similarly drool by all means help save the OP from themselves. Though I suspect in those cases that there are other things that you should be cleaning up too.