Wealth is indeed a proxy measure for certain behaviors, but you're ignoring other even more important behaviors like impulse control and an eye for risk analysis.
Most of us aren't wealthy because we engage in unethical practices; we're wealthy because we understand long term planning and self control.
Here's a related article you might find interesting about the link between self control and wealth. Note as well the negative correlation between wealth and crime, which stands in opposition to the association you attempt to draw above.
http://healthland.time.com/2011/01/24/the-key-to-health-weal...