I think it should stay. I believe though, that if it is there we need to go back to the original question to determine why it is a "floater" field where it appears sometimes and other times not.
As Eugene stated, he would like to have his relative show the Rev and as others stated, some people are putting it in the first name field so it DOES show which then causes an issue for searches as Robin stated.
I jumped the gun when I thought I had figured out the periodused in an abbreviated title in the Prefix Field, apparently the removal of the "period" doesn't make a hill of beans in difference.
So the original question is: what is the criteria or the mechanics, if you will, behind the scenes that allows it to show in a general surname search, not in an individual search where first AND last names are searched, and to "sometimes" appear at the top of a profile.
As Eugene also pointed out, a prefix is used in the first name field for certain projects, but frowned upon in general because of search limitations.