The fact that a good, easy-to-use Freestuff area is in and of itself an advertisement for a site seems to have been lost. New users of, oh, say Poser, aren't committed enough yet  to spending more money after just purchasing the program, and depend heavily on the generosity of more experienced users. Renderosity's decision to host files could be optional for members who have no other way to share things. And a link to "you might be interested in" Marketplace products would give the visitor more control, sound more like a suggestion, and attract people who are amenable to purchasing something. Honestly, some things you just want to add to fill an image (free), and some things you'd be willing to buy if you can find it. 

I can't help wondering how many first-time visitors to the Freestuff area are going to think it's just too irritating to use, and  wander off elsewhere.