I love wordpress for having so many free, high quality themes. But even with so many quality free wordpress themes there is still a market for paid themes, in fact, I’ve been selling wordpress themes for the past couple of years. If you’re considering creating wordpress themes to make a buck I recommend you invest a lot of time making sure its a high quality theme that includes great design, social bookmarking, plugin integration and regular updates. Users download/buy a theme because they like how it looks, or because they see a good base for there project. It’s also vital that the theme looks fine in all the latest browsers. Just my two cents on paid wordpress themes.