If someone offered you a comfortable, successful possition in a morally questionable situation, would you accept? Why or why not?

I think that if I questioned the morality of a situation I would porbably have second thoughts on accepting a possition because if it involved me dealing with any kind of risky business, I would be scared to get myself in trouble somewhere in the long run of things, and I'd much much rather have a clean record, no matter how "cushy" or successful something might be.