<p>If we have learnt anything from recent economic upheavals, it's that, rightly or wrongly, bankers get big bonuses. Avaricious stereotypes aside, people don't get money for nothing. So what exactly do they do to earn this level of financial reward? Few people really know - least of all themselves. There's no magic trick that turns someone into a City superstar. It's often not the cleverest of the most hard-working who hit the big time - it's th...