I wear a glove for two reasons:
* It helps me anchor the club in the left hand more consistently.
* I have dry skin, and the glove helps keep away blisters. The Bionic Glove is really good for this. (Note: the synthetic gloves seem to irritate my skin more, and don't last very long.)
Leather gloves will last longer if you wash them every few weeks to get grime out of them. I use saddle soap to restore leather moisture.