I hate "wide screens" with a passion - I call them short screens instead. My pet theory is that the LCD manufacturers like short screens better because they can sell fewer pixels while still advertising the same diagonal length.
Besides, 4:3 screens aren't square either. Why not demand 1:1 screens? Wide screens are more aesthetically pleasing (for most, not all).
I have 2560 pixels wide but I have a 27" iMac and sorta consider the screen almost a "freebie" with the computer (considering how little extra the 27" costs). A similar stand alone screen is crazy money though..