People who use this line have obviously never heard of something called inheritance. Becasue of this, class mobility is very rigid. This is true, but this doesn't mean Billy started as a poor boy. Back in the early 80's you had to have heaps of money to buy the kind of computer equipment Billy had. Plus his mother was buddies with the President of IBM, that always helps.
Capitalism is complimentary to human nature.
But of course, in reality, traits that make you a bad capitalist, make you a good person. Capitalism provides jobs for workers. Oh yes, we should all be thankful to our capitalist overlords for allowing us to whore out our time and skills so they can become rich. The media has done a good job at brainwashing people into thinking an equitable worker-managed workplace where workers reap the rewards of their own labour, instead of a rich old man, is inconceivable. A good economy makes everyone wealthy.