Custom themes are like wearing a tailored suit; they fit just right and feel unique. I’ve always admired the work of designers like Studio Press and ThemeForest for their creativity. But hey, sometimes a good premade theme can be the perfect shortcut when you need something quick and stylish.
I don't mind using premade ones, if I had the money I would hire someone to make me a few themes though! I do have a custom theme on Gex Forums, my awesome co-admin modified one of his themes and it looks great!