Write for yourself as much as you want. You will always be interested in what you have to say. Other people, however, are rarely interested in everything you have to say. And who can blame them? Nobody's interests match up 100%, and matches over 50% are basically soul mates. As a result, if you really want people to listen to you, make your writing count.
Writing that you share with others should be a near final draft version. You need time as well as trial and error to organize your thoughts in a coherent fashion that will be easy for other to understand. If your writing is just your first try or even just listed thoughts, no one will be able to derive meaning from your work, and the whole purpose of your endeavor goes down the drain. Likewise, people don't have the time of day to baby-sit you, correcting your work. That's what parents are for.