Well, duh.
I think my brain just shattered. It never occurred to me that anyone with brains wouldn't know that. If you were rednecks from my hometown, yeah, but you guys...
My standards are too high.
It's not really odd, at least for English. Things are pretty heavily separated into categories, and the "it" category is just like the drawer everyone has in their kitchen that's filled with everything from twist ties to tools. Talking about a specific person uses the apostrophe because there's inherent knowledge of what that thing is, from a person's name to a rock. Using "it" generally means the person doesn't know what the hell it is, so it isn't entitled to an apostrophe. Of course it's different like in this sentence where the "it" refers to a specific thing that is already being talked about so it does get an apostrophe because we know what "it" means.
That's my roundabout explanation and I'm sticking to it. Whether or not it's the official explanation, I don't care because that's how I see things and my world is so much cooler than yours.
Then it would look funny.
Besides, we all know how fucked up the English language is. It's the mutt of all languages. You can create whole new words and ways of speaking, but if you screw with the apostrophes, you'll get smacked by the grammar police.
And if you use l33t speak around people that actually write out "four" and "you."