They need a market for cut sheets. In a way I'm surprised there is much of a market, it is probably just us here who wants it. All labs will just want rolls for their machines... the fact that I can still buy cut Endura on eBay (expired) says there isn't much of a market sadly. We need to spread the word on RA-4 printing while we can. There isn't any cut paper in Canada it seems though thankfully I can get it shipped in from the US in a few days.
I'd love to try printing the new Portra to 30x40" to see how it looks but I'm not set up for anything that big yet... are you saying that 16x20" isn't much of a test for it?