Last.fm Compatibilty

Just a random thought. I use Last.fm and love the way it tracks what I listen to, what concerts I am going to, what my friends are listening to and allows me to find new music. The new music compatibility feature is also a nice amusing feature. BUT WHY is it I have REALLY low compatibility with everyone I see here in MA but if I find 18-25 year olds from Yorkshire my compatibility is SUPER? I am so living in the wrong place.