""Four grand for a printer!?" and I always wondered wtf she was buying."
Large format printers i.e. those 44" to 60" wide can easily costs in the range $3,000-$10,000 or more.
Needed by all those people for whom A3 is a small format (designers, architects, graphics artists, photographers, etc.) and who can't outsource the print to an external shop. And of course those external printing shops themselves.
You have to be careful about those printers size and weight too, before ordering one - and plan carefully how to bring it to its installation place. a 60" printer can be easily over 2m long, and weight over 150kg. Often they are designed to clear (barely) a standard 80cm door, but you have take into account if the path across the door is straight or not.