Blizz is all about the money man, I still think piracy is the top reason for the no LAN on SC2, but that's just my personal opinion you know.
Everyone knows the ladder is ****, is no parameter to measure players skills after a certain point; but it is useful if you want to get better, you will probably will get matched with the closest person online that has a similar level of game like yours, if you have a team or clan, or other professional friends, then ladder is worth nothing.