I regularly print out diagrams on ordinary paper, then tape the pages together to get wall-sized images. This works fine for every need I've found, and other than a bit of time spent taping up the final image, it is actually much faster and more economical than using a plotter.
I can't think of a reason that I'd need dozens or hundreds of copies of a wall-sized image. If that need cames along, I'll address it then. My needs are for things I can carry into meetings, print conveniently, fax when necessary, and generate PDF files simply. Using ordinary "garden grade" printing works nicely for those needs.
If you have some special needs that make a plotter necessary, let your needs be your guide. At least in my mind, that is a "special need" that is specific to your circumstances, not a general need where I'd expect others to be able to offer much assistance.
-PatP