Whether writing a blog entry or a business letter, it is important to write in a professional and appealing manner.
If you use sloppy grammar and sentence structure, what does that portray about you? If you are trying to make a point, your writing should give the impression that you are knowledgeable and sincere. Just like making sure that you look presentable at an interview, you should be presentable in your writing.
If you want to be taken seriously and your message considered in a serious manner, it is up to you to show yourself at your best. In the case of the written word, that means correct spelling, good grammar and proper sentence structure.
By using the proper words, written correctly and in grammatically accurate sentences, you tell the world that you are an adult with valid views. Your good grammar and sentence structure brings weight to bear on your message. You are making a believable and convincing statement, and one that should be taken to heart.
The best ideas in the world will be ignored if they are dressed in a shabby and ill-kept manner. Polish those words. Dress them up as if they were trying to impress someone.