I already knew that, but my point was, that just because knowing other's location, age, language etc, makes you feel comfortable, it doesn't mean that you or anyone else has a right to FORCE the people to share what they don't want to, and in a way pry on others. No offense intended.

I think Tobi has explained very well why Distro. shouldn't be made mandatory, also I have noticed that some people just don't want others to know their browsers too (which they use for posting)! I find it very surprising, but if they don't want to share, it shouldn't forced upon them.

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How then to increase quality membership?

I would think that comes automatically. Every member will get his questions answered, if possible, and will, if necessary, also be "taught" how to get the wanted information (Google, man-pages, tldp.org, ...) and how to ask smart questions. In short, LQ is educational. This will lead to more knowledgeable (increased quality) members automatically, to the point where these members are able to help other members.
This way it worked since LQ exists, I would think, and regarding Linux questions I would think that LQ is one of the highest quality forums on the net, if not the one with the highest quality.

Define please "quality membership" w.r.t your view point.

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I would recommend just detecting the poster's location. It would be more accurate.