All Posters.com has an incentive. When you buy a certain amount of posters you get a magazine subscription, but you can opt for a rebate instead which is what I chose. I sent in the form and a copy of my allposters order form to Value Mags over a year ago.
I called once and an unprofessional sounding Value Mags rep. hemmed and hawed and said they were behind on their rebates but would get them out soon.
Recently I wrote to them again and they wrote back and said I had not given them my order information so the rebate was rejected. This is a scam. I have all the documentation that I sent to them as it is labeled and stapled together. They are scammers so beware. I intend to contact AllPosters about them too.