Other psychic factors being equal, it is to everyone's self-interest to maximize his monetary income on the market. But this maximum income can then be used for either “selfish” or for “altruistic” ends.
As some conservatives increasingly argue for an ever larger state to support "families" and "society," Burke showed through both words and personal actions that the real answer to building up civil society lies in the private sector and not in government programs.
The theory goes like this: capitalism combines with consumerism and advertising to make us sad, lonely, and forever chasing after material goods. So we consume endlessly and the Machiavellian capitalists reap the rewards. It's not a great theory.
At this point mal-investments and false market signals have been accumulating for many years. The effects can be seen not necessarily in a future "crash" but also in our current weak and declining levels of economic growth.
Competition for wealth and social status was hardly created by the capitalist system. People have always competed for these things. Thanks to capitalism, though, this competition is now less violent, and true poverty is easier to avoid.