Some people (particularly senior folk) on Wall St do in fact get significant bonuses like you describe. And many companies like to attract employees by talking

Some people (particularly senior folk) on Wall St do in fact get significant bonuses like you describe. And many companies like to attract employees by talking about bonuses. But, unless a bonus is specifically stipulated in your contract, I wouldn't count on it. Your bosses can always come up with some excuse for not giving you the bonus -- especially if you're a junior employee. As such, you are quite disposable and replaceable.