I don't think Renderosity has to choose between Studio and Poser. They aren't making the content, they are just providing a venue to sell it. Offering Studio content isn't pulling their developers away from working on Poser. It would be a choice if Renderosity was a content creator with finite development resources to distribute between the products, but that's not the position they're in.

They could decide to give incentives for Poser content creators over DS, but that's a fine line to walk. If they drive Studio content out of the store, then there are fewer people here to see what they're accomplishing with Poser. Might be counterproductive.