Actually would have to see the study. Often times studies like this generally are weighted specifically go get such kinds of answers.
So it depends on the questions and the definition of morality.
I wouldn't be too surprised though, since you'd think assertiviness and ehtics are tied together in someway, and assertiveness is tied to success.
I sorta doubt being unethical leads to more success though, because there is a HUGE hammer if your unethical and fail during most of your life.
Although I suppose it could be due to relative population size differences.
IE, people who bet their lifesavings one blackjack hand once in their life are probably disproportionatly rich. Even though more then half of them would fail at the game. Simply because the sample size of "rich" is lower then the normal set sample size.
