I have a hunch that your downvotes don't indicate that people are disagreeing with you; it's just that your question is very vague and ill-posed.

If you think about it, you are basically touching on the age-old question of trying to give a rational refutation (or justification) of unethical behavior.

Your question is of course a limited version of this, namely: "Should ethical behavior, even if necessary in society at large, be temporarily suspended in business transactions?"

This is a very complicated question which I don't think can be easily answered in a forum post.