Making money is acquisition of resources. That is today's survival of the fittest, unless you'd rather go back to the "natural state" of physical conquest.
You completely missed the point. You don't have to be fitter at the acquisition of resources if you have a huge amount of wealth already, because there is a systematic unbalance that will help you amass more wealth by basically doing nothing. As I've said, I've met borderline retarded people in my life that inherited big money. They don't bother with things like money, they are basically sitting on their hands trying not to destroy anything. They are unfit by any definition of the word, yet they will raise their net worth more than anybody busting his ass and actually being a good businessman that doesn't get extremely lucky by some coincidence. There are entry levels to illustrious club of century old money nobility.
So you see, it's really not "survival of the fittest", no matter how you look at it. That's just the idea rich people managed to implant into the usual gullible citizen so they believe today iteration of capitalism is a meritocracy or based on the actual marketplace of goods. It isn't. The most common way people get rich is by inheritance, which means that most of that money stops circulating and concentrates on few individuals, which is inherently bad for any economy as described by the consumption equation.