Do not let first impressions fool you.
An example, illustrating the benefits of not letting first impressions fool you, is that of a car dealership. Car salespeople tend to make snap judgments about potential customers. For example, a teenager may be blown off since, after all, he is a teenager, and probably would not be able to afford a nice car. A car salesperson works on commission and so wants richer customers who can buy more expensive cars. However, later that night, the teenager could come back with his parents, and purchase an extremely expensive car, and another salesperson would get the commission.