If people want to keep their personal information private that is their prerogative.
The fact that some people will view a profile because they are curious about the poster is one reason why some people don't want to fill one in – many people watch the forum for a long time before deciding to post, feeling that they have to share personal information would just be another barrier to participation.
If someone's enquiry can be better answered by knowing which area they are in, ask them in a non-threatening way, rather than berating them for not wishing to share personal information.
David – Top left click settings then click 'my profile'.
Neil