I have seen spectators become mesmerized, and hinge on every word spoken by the performer. And I have observed that Magic can be much more than unique entertainment - it can be used as a tool for marketing, for product recognition, and presenting a message. A successful booth is one that has traffic. Magic is a great way to get people's attention, and keep them at your booth for sales presentations. Most employees are great at communicating one on one, or in a small group.
Magician can provide personal entertainment, making the time go by faster.
And, if a large group is seated, the Magician can stroll by at pre-set times, helping the servers with the extra time required. As this site has illustrated, I am a Born Again Christian. Certain magical effects can illustrate Biblical principles, as well as triumphs in my own life. Rather than view Magic as deceit or trickery, I prefer to view my art, and the time I have devoted to it, as another way of serving the Lord.