I think it does have to do with demographic area....but that counts in the US also. Here on the East Coast (in the Northeast) I am located 2hrs from NY...so not only do a lot of NYers come into our area to live (because it's cheaper then NY but close enough to commute for work) and I swear that being that close to headquarters gave everyone this 'aire' of superiority! We always got regular Bethel speakers, visitors, invitations to the annual mtgs, etc. But the RULES seemed to be upheld a lot closer here also. Having so many JWs in and from NY and then being a quick drive there, it made things rather strict.
Now I have friends on the West Coast (California) and also down South (Miami) and THEY have a completely different attitude about JW rules and all. The way they dress, act, things they say and do...everything seemed more 'lax' to me. Things they did would NOT fly up here in the NEast and would cause major issues in the cong IF they lived in this area of the US. But I'm guessing that since they are further from headquarters, and mix in the climate difference (summer all the time) - I understand how they tended to be more easy going when it came to the rule.