So, as the opportunities to amass greater wealth increase, some people do so? Gee, didn't see that coming.
One thing these articles never seem to discuss is why income inequality is such a good thing. Once upon a time, I worked minimum wage jobs. Later in life after college and some practical experience I made pretty good money. If there was no income inequality I would not have been able to move up through hard work and education. The low wage jobs "gave" me the money I needed to fund my progress and helped build a strong work ethic. The higher wage jobs gave me the money I needed to live on, and a reason to advance myself (and provided a lot of tax dollars to pay for things that people in their low wage stage couldn't).
Of course, some people choose not to move up. They are no worse off because some of us do, actually they're probably better off (not a lot of poor people providing those low wage jobs). Articles like this one seem to imply that everyone is stuck in one "class" or another -- the rich get richer and all that -- which is nonsense.