...what about perscription drugs?....
Another excellent example of what you DON'T want to happen. You start off with the intention and the hope of persuading somebody, even if it's just one person, not to buy fake bags, but when you do so using your own beliefs and values and opinions, you are just setting yourself up to get sidetracked. The fake bag buyer may have a very different view than yours on the whole subject of prescription drugs, and before you know it, she has led you off into a discussion of the various activities of this or that pharmaceutical company in this or that place, and you are doing a great job of answering her, standing up for your beliefs, and your opinions on the subject - which is now NOT fake bags and why she shouldn't buy one, but a debate about companies and prescription medicines!
I am saying don't let her do that to you! Maybe to you, the risk of losing money is the
least important reason not to buy a fake bag, precisely because you do have certain attitudes, opinions, beliefs. And maybe you also have a lot of money.
But you can't count on your target, your opponent, however you want to think of her, this potential - or habitual - buyer of fake bags. Your objective is to convince her not to do it - no matter whether she agrees with you about prescription drugs or intellectual property or wheat tariffs or sex education on schools or what age girls should start dating!
So you look for an argument that will make her stop and think regardless of her opinion on any of those things, something that
everybody can relate to.
The best thing I've been able to come up with is the risk of losing money. But I am hoping you and other people will think of other good arguments against buying fake bags that do not depend on your opponent sharing any of your values, opinions, or beliefs!