Digg have back themselves into a corner by editing or burying many of the commercial submissions. It looks as though they intend to capture a bit of that commercial market they have despised:
They hope to provide a system whereby people can Digg just about anything, from restaurants, products, images and not just news and videos. ... They hope to look at what kind of stories you have previously dugg and suggest similar stories to you that they think you will like.
Can they retrain users to think commercial = good after they trained them commercial = spam? As Digg moves away from tech toward commercial interests what are the odds that the signal to noise ratio is greater than 1 in 100? Will Digg eventually offer a paid inclusion service?