If you only use the badges supplied by the trade show producer, you are just another exhibitor at that trade show. But, if you develop a real company badge, preferable oversized, that reflects the Logo, colors and fonts used by the company, now you stand out in the crowd.

If you have a 10 ft booth, and three people to man the booth, you will always have 2 people in the booth and 1 walking the trade show floor.
Why? People read badges, and if they see your unique badge it just may be enough of an incentive to find out more about your company and stop at your booth.