I've been there for a while, so I'm not sure what criteria they are using to choose between vendors. But of the ones who are there, RDNA certainly support both CP and DAZ figures, as does Netherworks. Sixus are all original content that is outside of the store figures; meshbox do architecture, Vanishing point does lots of different things, there's someone who does music tracks, and lots of people doing 2d photoshop content.

I've got an Apollo character there (as you probably know; yes,I'm sorry I haven't stopped by or done anything new for Apollo - I've got a Koji fixation at the moment and each character seems to lead me into another one.... but I'll be back around) and people who are already brokering there have no editorial interference on what they choose to sell. I seem to recollect that my Apollo character got a slot in either the newsletter or the front page, so they can't have been too offended by him.

I'm sorry they weren't keen on Apollo products; I suppose if there's a queue they'd give preference to people who do at least some support for their things. There are several brokerages who operate through CP as well as running their own stores - perhaps one of those would be interested? Since there's no particular requirement for exclusivity (AFAIK), you wouldn't have anything to lose by asking them.