It seems to me that comparing the UK Head of State with the American President isn't really the point. One is a political Head of State whilst the other is in reality more symbolic. Different systems completely. The real head of gvt in the UK is the Prime Minister. There is surely a strong argument to say that as a child of (take myself) a low paid mill worker and a school dinner lady I'd have as much chance (probably more chance) of becoming the PM than my American equivilent would have of being President?. Though with the UK gvt having been awash with Eton boys of late it seems pretty unlikely too.