Why was the speaker wire installed this way for a media room?
It looks like the intent was to have your "media center" be placed on the far left wall. This is why you would have 4 electrical outlets and the coax connectors. This is the location you would either want to place your TV or projector screen. If you do go the projector route, placing the screen on the far left wall gives you the distance needed between the projector (placed near the outlet on the ceiling) and the actual screen.

The speaker wire does seem a bit odd. The way I would use it is to place 2 rear speakers in the top right and bottom right corner. These would be feed off of the lines that run toward the left of the room. Then your front left, center, and front right speakers can be easily run to the electronics on the left wall since they are so close.

You haven't specified, but if I designed a room in that fashion, I would have run 2 channel speaker wire (4 wires per jacket). This would then allow you to add the side speakers if you wanted to hook it up that way. Maybe the speaker wire you show has 4 wires in it to be used in this way.