WooCommerce customer-specific pricing means giving one named account a different rate from everyone else in the same group. You set it on that customer’s user profile rather than on the product, so nobody else sees the change. One long-standing buyer negotiates a better rate, and the only obvious way to honor it is to build a whole new wholesale role for a single person. Do that a few times, and you have eleven roles, nine of which contain one customer each. There is a cleaner way to handle WooCommerce customer-specific pricing, and there is one setting that trips up almost everyone the first time they try it.