I haven't collected stamps in 30 years, so I'm not sure where that market is. Around the time I was dropping out of that hobby, there was a controversy around the value of stamps being produced by countries more for collecting purposes than actual use as stamps. Mint stamps, from those countries, had cancellation marks on unused stamps so that they couldn't be bought in bulk and used to send mail. Real cancelled stamps were worth more than unused ones because only a small fraction of those stamps were ever used on real mail. There are still ads for stamps like those, but I don't know what the real stamp collection value is for them The photo stamps can at least be used. From that standpoint, they're truly stamps. Images on them separate them from metered mail. They're not the same as real US stamp releases. As with anything, there's always going to be some collectible value to somebody. These stamps probably wouldn't mean much to a stamp collector because they wouldn't show up in a guide. If large companies could get a better price break, they could potentially be releasing floods of stamps that could be as plentiful is standard postal releases. People who collect certain subjects would want stamps put on on them. I can imagine a limited edition set of stamps put out by name artists being of interest to various collectors. I could see various Poser artists using stamps, with their artwork, to send letters to friends and others. It's too expensive to put on bills, but it does provide a different means of showing of one's artwork.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon