Money is green, we can agree on that. However, pastures seem to be greener if you use the extra space to plug in more stuff.
I use a 1440x900 laptop screen. There really is nothing more annoying than to browse a site that is still optimized for less than 800x600.
Take this, for example:
http://www.forummonkeys.com/forums/index.php
That thing uses like a third of my screen. It's just not practical at all, and I've seen several porn blogs using that table width.