I feel like people who need that many monitors are actually in need of (a) better window management (/manager).

Consider it like a tiling window manager, but each monitor is a 'tile', allowing each tiled application to still have a full-sized window that's not cramped.

And, yes, of course there's a center monitor that's the main workhorse. But I want other things to be visible at a glance at any time, without needing to move or cover up my main work piece to do so. For me, I'm a writer, and the 5 extra screens are often used for notes, outlines, maps, research material, etc. That way, I can have all that stuff open and available to reference with a glance, without needing to pause my typing on the main screen, without needing to take focus* away from the main document I'm working on.

*By focus, I mean in the window manager sense -- the main document's app remains the one in focus, the one receiving keyboard input, so I can continue typing even while looking at my notes.

Needing to switch between apps and take the focus away from my main document in order to check my outline/notes/whatever would really slow me down and would just be a pain, no matter how easy switching is. Trying to tile it all onto one monitor sounds horribly cramped, making each window small and difficult to work with. (Maybe if I tiled it all on one huge monitor, it could be acceptable ... but 6 small monitors are cheaper than one really huge one. It would have to be a massive single screen in order to have the same amount of screen space and resolution as 6 monitors.)