Just trying to think from the other side as in "common" John. I don't think I've ever known anyone with an A3 inkjet although visiting something like a photograph exhibition in a local church by a nearby camera club does indicate to me that there are some home owner/enthusiasts that do have that sort of kit.
I used to know someone with an even bigger inkjet BTW. He had a monster A2 inkjet printer. He was a professional cartographer running his own business though.