The majority of folks that use Poser or DS do not use all the content creation tools. Back when Poser Debut was available (for around 25-50 I think), all it did was load pose and render content. You couldn't make or modify anything. I'm not sure it even had animation features. The goal here is to provide a vehicle that anyone can start using and get interested in the content that's available. Chances are they'll eventually decide to start making or modifying stuff and want to upgrade to the full premium version. Rosity is still a content store primarily. So if they gave their customers a free entry version of Poser to use some of that content in, then its more likely they'll keep folks coming back to buy more content and statistically at least a portion of those users will eventually upgrade. A lot of people still prefer the Poser interface over the DS interface anyway, so Poser/Rosity has that working for them too.