This whole thread seems pretty trollish to me, but as a Cambridge alumna who did take six A-levels, I want to say that having six didn't help me to get in. I was told as much by my Director of Studies. What did help a bit was the fact that I took two of them in one year and was largely self-taught, as I couldn't attend the timetabled classes (not without a Tardis, anyway). My referee commented on this as demonstrating my capacity for independent study, which is something they do look for. But this was only a small component of my overall application. I didn't do six subjects because I thought it would increase my chances, I did them because I really liked all the subjects and couldn't decide which ones to drop. I think this is the only sensible reason for taking a larger number, as it won't give you much of an advantage.