Can you suck at grammer and have a successful blog

Nick Sullivan of internet babel wrote a intresting article titled "Big bloggers and bad grammer". I think its a really intresting topec. Grammar has never been my thing and I have never kared to really learn it. I nowe its very important to some people. I guess if I ever get in the business of blogging I will take some english classes orsomething. So srsly... does good grammar matter to you?