Grammar5Oh!

That's such a simple question. And you'd think that the answer would be just as simple, but in all actuality, would it?
Really, why is grammar important?
According to grammar.about.com:
Grammar is important because it is the language that makes it possible for us to talk about language. Grammar names the types of words and word groups that make up sentences not only in English but in any language. As human beings, we can put sentences together even as children--we can all do grammar. But to be able to talk about how sentences are built, about the types of words and word groups that make up sentences--that is knowing about grammar. And knowing about grammar offers a window into the human mind and into our amazingly complex mental capacity.


Well, that really doesn't tell what it's about... in my opinion at least.
To me, grammar is important because it proves your intelligence. It tells people that you're sophisticated, and at the least, that you aren't lazy.
But, if someone has a reason for not using correct grammar, that's fine. But if you just leave out apostrophes and commas just because you're in a hurry to write/type/text something, that's annoying.
Perhaps shortening words in text messaging and online is acceptable at times, like if you're in a hurry or something, or if your phone's keyboard is just too little and confusing to figure out how to add commas and apostrophes. That's fine, I guess...
Also, I have another "pet peeve" (is that spelled right?)
My English teacher went over this in class today.
Whether you're online, texting, or writing a note, you can always use the correct form of a word.
Example:
We are having a sell this weekend.
Sell should be spelled sale. Not sell, not cell, and most definitely, not sail.
Unless, of course, you have an acceptable excuse for doing so. I can only think of two. And chances are, you aren't doing either of those, so you should think about what you type/write. Just saying, y'know. Opinion.


But anyways, I have rambled enough, and I'm way off topic now, so I think I'm gonna go for a walk or something. xD