Good point. Still bothered by OP..........but what can you do 
Not much I guess. But to be clear, my post is aimed at those who would otherwise be lazy and use MSN type short hand, or not care (or even be aware) of the differences between "Their" or "There". Not necessarily serving members (even though it should still apply).
I get what your saying to a point, but overall you're basically arguing against improving ones self. I mean, if we were talking push ups or sit ups instead of grammar, everyone here would tell a would be member to do as many as they could and never mind about a finite number.
Same applies to spoken and written skills. Why settle for what will get you by? Go for broke and improve.... after all, that grey matter in between your ears is a muscle of sorts, just like your biceps.... if you don't train it, it'll get weak.
But, just to give a personal note to this: At the Canadian embassy where I work, I have dealings with the DND folk posted here quite often. One of which is the Attache himself: a Colonel. So far I've been through two, first one was Air Force, the Current one is Army.
The AF Col. was, as you might expect, the more "primp and proper" sort. Where as our current Colonel, who is Ranger qualified, served in the Airborne Regs and commanded the Pathfinder platoon is perhaps less so. But with both, I watch how I speak, and because of that we are now on a first name basis: He calls me John and I call him Colonel

But in all seriousness, if I was the type to use "Dude" or start sentences with "Like", I would not have been able to develop the good working relationship that exists between myself and the Attache's office. Same goes for the W.O. ( I've also been through two of these as well).
Although it is not the only reason for our good relationship, in both cases, my ability to speak to them in a proper manner, has gone a long way.