I agree that it would be nice to know where people live, especially when they are asking for help in finding some ingredient or item - and in some cases just knowing what country they live in would be a big help. City and state are great helps for those living in the USA, but even state would be a help (or if in a big state like CA or TX - the portion of the state would help narrow things a little without being too specific).
But, as GB pointed out - that can be enough information for someone to locate you when your user name is your real name (full name or initials and last name). Add that and your location ... makes finding your address and/or phone number pretty simple - and for a fee even more information is available.
If your username is not tied to your real name, or just your given name but no connection to your last name, there is little to worry about.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain