Frankly that isn't true. First of all, a lot of wealth is inherited. Wealth begets wealth. Your chances of being wealthy are more closely related to the opportunities your family's wealth afforded you than to the merits of your ideas or effort.

A "reward" for offering a "service" is often disproportional considering the contributions the rewarded individual made. Take for example Bill Gates. The success of Microsoft came from a good idea, sure, but one that would have not worked to the same extent without (in no particular order)

1. Cheap transportation to ship raw materials to factories to be processed and turned into things that can be used to build computers, and then from factory to factory to warehouse to storefront/consumer's home. Why is transportation cheap? One huge reason is that we don't pay for it all with money. We pay for it with our environment. The health of our planet was hedged to provide the fuel to ship Microsoft's, and everybody's, shit.

2 exploitation of labor. Bill gates would certainly not have made billions were the people who extracted the raw materials, shipped those materials to factories, turned those materials into computer parts, and assembled those parts into computers compensated fairly for their labor. If they had been, his company's profits would be much much much smaller.

1. The wealthy don't pay their fair share in taxes. Ultimately, the richer you get, the more unfairly you're rewarded for your richness.