Well like I said, I've been told many times specifically not to do it (since I used to myself and I got a 4/10 from my tutor because of it the first time =X), so I dunno wth happened there but ok. And still, the essays you buy in bookshops tend to be pretty crap as I'm sure you've realised, even the high scoring ones. But its probably just one of those personal preference things I imagine...plenty of those in structuring English essays, such as what to put in a language analysis intro etc. And I imagine that examiners don't take into account such personal preferences when marking, since it's obviously way too unfair, and just mark according to whether it makes logical sense or not.