If you are not reading industry publications of the industries you're servicing, shame on you! American Salon is just one of many you should be looking into. There are many good articles that will help you, as a sharpener, better understand your customers needs.
Here is a link to just one article that will make for a good conversion piece while you're in the salon. Take a look and brief through the archives while your at it. Reading the publications of the industry you service is a must do practice. Make it a habit!