Naw. Prints aren't cheating the person who has the original, because they're obviously prints. I don't think the lucky bastard who owns an original Gauguin is much concerned by all the prints out there. If I were you, I'd do prints and maybe some POD merchandise with the image (it would make amazing shirts). I'd love a print but am, I'm afraid, rather poor. Good to know they're available for when I'm flush, though.
Just visited Zazzle - design has changed quite a bit since my last visit, I had an account log time ago, I think I still may have one, it didn't go well, so I just dropped it, I was thinking about screen printing on shirts, I love when I actually can see the finished product, and when I have done all the work
Sales wise, I do a lot better with Cafe Press, but Zazzle has some great products (shoes, ties etc...) that Cafe Press doesn't offer. Silk screening your design is cool, but I think you should also have an internet option.