If you plugged the ps3 into a computer monitor that had a native resolution of 1920 by 1200 the image would be streched to fill the screen because computer monitors don't have a scaler in them. It would look less than optimum. Also all the games that only output at 720p would look like total ass on said monitor.
Again i never mentioned computer monitors because they are less than optimal to use with the PS3.
I would love all my games at 1080p60 it would be great but since the technology isn't there yet thems the breaks.