I'm in the non-existant 0 category as well. But not for lack of trying. Last month I picked up a Fictionwise acct to buy an EBW1150, and sat down for a couple evenings in a row to peruse their titles. Every book they had that I wanted was DRM laden so I didn't purchase any.
I may switch out of the 0 category, as I am considering getting Baen's webscriptions. For now, I have plenty of free/PD titles to chose from, and plenty of pbooks still filling my shelves.
-MJ