The problem is no open source (or even closed) come even close to the Photoshop workflow, and also integration with other monopolized software like Illustrator and Fireworks. It's also one of the reasons why a lot of people can't switch to Linux, winin' it is just not good enough
What will this mean to the Ubuntu Store (and other distros "appstores") since steam is arriving on linux? I know competition (even if it's against a free service) and new things move the world but god damn everything is a mess, everybody wants to sell everything and make their own software haha.