For the most part, capitalism makes people rich if they have capital to begin with and can invest this capital somewhere (i.e. have someone else do the actual productive work and then collect part of the wealth that they have produced as economic rent). That is, the "value" is in giving others access to resources that you have hoarded from them in the first place.

As for violent revolutions - very true, but notice how every time that happens in one country, the others tend to swing left economically because it's either that to placate the workers, or face the possibility of revolt. The primary beneficiaries of the Russian revolution wasn't the Russians - it was Western workers who managed to get a lot of concessions from their employers riding that wave.