Curious...

I was reading something the other day online. There was a posting on a bulletin board:

"Well, I can see u have extensive insight into the plight described here based on the content of ur assessment. Unfortunately, I can only experience this from the perspective of an outsider."

Nice statement. But with all that, why would he write "u" and "ur" instead of you and your? All those letters, and he's worried about saving 4?

I don't get it.