A number of people have left Allposters as they have changed the rules and now you have to make a min amount each year in order to be paid out. I’m not sure if you’d want to do this or just use Amazon and Zazzle instead. Personally I think it’s worth it now (the commissions are better for one), however a couple of years ago it wouldn’t have been worth it for me.
One of my fellow Antipodean Lensmasters has actually made a lens for people to help with formatting Allposters - Formatting AllPosters on Squidoo.
Do you use Allposters?