Providing for one's family as a good husband and father is a water-tight excuse for making money hand over fist. Greed may be a sin, exploitation of other people might, on the face of it, look rather nasty, but who can blame a man for doing the best for his children?
Believe nothing, O monks, merely because you have been told it or because it is traditional, or because you yourselves have imagined it. Do not believe what your teacher tells you merely out of respect for the teacher. But whatsoever, after due examination and analysis, you find to be conducive to the good, the benefit, the welfare of all beingsthat doctrine believe and cling to, and take it as your guide.