I don't think so. Henry Ford for example realized that paying solid wages allows people to buy more cars [1], in turn increasing the profits for Ford. Reducing inequality in a society strongly correlates with social peace and happiness, which in turn fosters the economy. Good social equality also helps a larger part of the population to achieve good education, broadening the pool of skilled labor. Certainly, a single bad actor in a good environment can reap benefits from behaving "anti-social", but in the long run that's a spiral to the bottom. So I think that smart companies should be concerned about a raise in inequality, even if it's only for their own good. And making sure that you keep inequality low in your own workforce is the first step.
[1] http://corporate.ford.com/news-center/press-releases-detail/...