I don't think Hudson is kidding about spinoffs at all, and I think you should take a really solid look at them, because they might end up making more in the long term than the decks and books. Well, maybe. Although it's unlikely I'll get the deck, simply because it would most likely not get used to its potential, and I don't collect per se, I was quite serious about wanting a couple of prints if you do them.
A while ago I mentioned Zazzle.com as a place that did pretty good prints, and while I know that you prefer to keep quality control under your thumb, they offer a way that people can get prints on several different types of paper/canvas, with options for framing. (In the US, at least)
The thing is, when you post a graphic there, you're giving them a limited license to produce the prints and/or notecards, and any sales give you royalties. Less than you'd get selling direct, but it means you don't have the costs of inventory and shipping, and there's never any problem with "out of print", since the items are created one-off, and it needn't get in the way of other direct sales that you'd like to do.
My printers are sort of more or less - well, I talked to them yesterday, and was promised an email with a copy of the sign-off sheet that I could print out to send back with the last couple of things they emailed me, and I haven't seen it yet.
Just as well, though, because I'm trying to cope with my landlord deciding to sell the building I'm in, which means finding another place (I think I'm going to buy a condo this time so it CAN'T be sold out from under me), finding a realtor, getting mortgaqe approval, etc., etc.. A week ago I hadn't any notion of moving, and I'm still going a bit sideways.
Oops - off-tracking like crazy.