That gets into an idea I've been pretty adamant about. People say that capitalism is the worst system except for all the others, but its actual property is that it's inevitable. Money (power) can be used to gain more power. If even a few people choose to do so, if not countered intentionally by some outside force, wealth and power will accumulate.

Whether you see that as good or bad or something which needs to be checked and controlled is a separate discussion, but it's an obvious and expected result.