The design can sell the product, if you find someone great at laying things out and generally providing a look and feel that makes you want to use it then it wo

The design can sell the product, if you find someone great at laying things out and generally providing a look and feel that makes you want to use it then it would be worthwhile to retain that person. I believe that you can give equity that vests over time, so if you need to let the designer go he/she isn't tied in too much, only gets a small amount of equity.