basically if you want people to take you seriously, you gotta type like you went to school. like defy said, if you see a long ass essay all in caps, or a single paragraph, or no punctuation, you automatically are gonna write it off like they don't know what they are talking about because it is an "uneducated" thing to do.
but don't get your panties in a bunch, its a subconscious thing people do and I'm not saying you are automatically an idiot because you are too lazy or too "cool" to act type in an educated way.