What form of appeal is being made when a customer is referred to as 'one of these choice customers'?

The phrase 'one of these choice customers' employs an appeal to flattery by suggesting that the customer is part of an elite or select group. This type of appeal seeks to enhance the customer's self-esteem or sense of importance by implying that they are distinguished or valued when compared to others. The language used not only acknowledges their status but also aims to ingratiate the seller with the customer, reinforcing a positive self-image.

In this context, the tactic is effective in persuading the customer to feel appreciated and, as a consequence, may encourage them to make a purchase or maintain loyalty to the brand or service being offered. This sense of recognition and validation is at the core of flattery, making it a powerful tool in marketing and customer relations, particularly when trying to build rapport or persuade individuals to take action.