Unfortunately, the average Digg poster will see this and apply the 'Food Pyramid' rules - 'Today's posts will contain at least 15 DH0s, 8 DH1s,...' and so on. DH6 will be used sparingly, since it is at the top of the pyramid.
I suppose you could do the same for the Disagreement Hierarchy, but it would be harder to draw in ASCII. On the other hand, you could have a diving board sticking out of DH0 for jumping to conclusions.