I’m also surprised this has not happened yet. Not the whole “two paragraphs for free” part, but the ability for people to pay for ‘fluff’ related to commenting and such. I’m 100% positive that if offered, some people would pay a monthly charge for their comments to look different from others, be it a special icon or different text. Customizable interface, more RSS feed options, priority ping-back location, etc. People would pay for this stuff.
WordPress should get all over this, and then take an Apple-like cut of any of the profits, in exchange for handling the whole transaction backend so all I have to do is enable fluff at whatever prices I want.
Pure genius IMO.
(And no, I would not sell power, so no “comment goes to the top”, or “ability to delete other comments” or anything like that. I do have standards!)