Reasons for that are obvious, people needs arguments for this or that version (therefore different applications), and logo itself is usually just a piece of type and maybe a colored blob. But here's an idea. What if the whole design process can be seen in the blog? Like every sketch, every design i make, is there to see and to comment on? Would the end result be bulletproof from argumentation point of view or total piece of poo? Not sure what the client would think about it...