While I'm not recommending some formal requirement, I'd like to suggest that Chowhound posters (esp. in cases where they're asking about home cooking or menu ideas) indicate where they are located, either in their profile or in the message (or both).
Maybe because it's dead of Winter here in Indiana now, I'm especially mindful of what's (not) in season, and that has a lot to do with what I'd find to be good advice to offer. Additionally, I'm struck that when someone posts a query and my response is to ask where they're located, they sometimes don't even respond. Maybe a lot of people think it doesn't matter?