Yep, we can say same about capitalist system. Those who put more efforts have better results.

Organizing work of others and taking responsibility of the results of work is more hard work than just work. Understanding people's needs, forecasting them, saving money instead of spending them in restaurants (having the capital)... all that makes the system where rich people become richer, and it should be like this, because this system provides all the world with better technologies, making our homes more comfortable, and our life more idle. This system let us to reach Mars and even other stars. Without capital sticking to capital we could still live in caves.