Your statement is based on a false premise. Those of the lower classes who rise to the socioeconomic level of Oprah Winfrey are the exception, and you have framed your question in a manner that suggests otherwise. The wealthy 1% that controls the majority of wealth in the United States are not about to give up their advantage for the greater good, nor will the millions of men and women just as talented and hard working as Oprah ever realize a fraction of her success. One reason that upper class anti-capitalist revolutionaries have more visibility, and are more well known, is not only because of their intellectual abilities, but equally because they usually have the benefit of a better education.They also have a greater means to make themselves noticed as opposed to those of the lower classes.
Furthermore, you have also based your premise on the assumption that Oprah, and those like her, have placed all of their cards on the table. When speaking of class struggle, we are speaking of the longest war in the history of mankind. During wartime, there are those who purposely attract attention to themselves, and there are others who are active but remain quite. The former are there to act as a lightning rod; encouraging their comrades, while distracting the enemy. It is understood that these individuals will suffer persecution and sometimes even be killed. The latter support the revolution behind the relative safety of anonymity. A successful revolution requires both these.