I did not say that personal impact is equivalent to wealth. It was meant to respond to the parent comment ("some people claimed that the only objective measurement of the value of your work how much you get paid") and to imply that wealth is a result of personal impact, magnified through network effects (having people work for you, television/cable).

Gandhi et al. have had an impact that defies quantification (e.g. world changing)

I personally believe personal impact is answered by this koan:

What is the meaning of life?

It's up to you to define it.