Yes I get your points, that if you've not been 'allocated' a team from birth you are at the mercy of what is popular at school. Thankfully supporting Brighton has now become ultra cool, so kids that would had typically been hovered up by City or Liverpool are now becoming Brighton fans.
I dare...
TBF we are trying grow our fanbase to get some fans that live outside of Sussex.
Obviously I get your point and largely agree with it but other than locality theres plenty of other reasons for supporting a team, identifying with certain players, hence our growing Japanese and South American...