Knowing your customer builds a good relationship between the buyer and seller. With this, you can easily identify which one will be your top priority however it would also mean that you should check every detail about the person, this could also be used as a backed up data so when you need to trace the person, you know where to start. Millions are being earned from this business, and it is not easy to identify who earns it. but thru KYC they can have a way to identify them.