Blog Coops should, I think, be based around fulfilling members self-defined needs (as well as promoting new organisational structures to mainstream business in the defunct global economy).
So long as they are about providing for these needs directly (as opposed to trying to get enough money out of standard corporates), the standing order approach (or something similar) could work.
Also, since Blogger and TypePad etc give anyone a pretty damn good web presence, instantly, I'm not sure the web presence consultancy (WPC) is such a good idea - more comments on this at web presence consulting
It's not that a WPC wouldn't work, just that I think the blog coop model could more effectively be used to promote much needed social change and the radical democratisation of democracy.