If you leave aside the moral/ethical issues (which are very real, and which we each need to deal with for ourselves.) the usual rules of marketing apply; do y

If you leave aside the moral/ethical issues (which are very real, and which we each need to deal with for ourselves.) the usual rules of marketing apply; do you expect word of mouth? do you expect repeat business? If so, a reputation for dishonesty is going to kill the rest of your marketing. (Of course, if you expect to encounter each customer once and only once, and if you don't expect your customers to talk to potential customers, the rules are clearly different, and you are mostly back to the ethical question I glossed over.)