The simple fact is that DAZ3D has always been the chief provider of Poser content. Most sites or stores that provide Poser or DAZ Studio content are centered around DAZ3D content. (Michael, Victoria, etc.) I doubt that will change.

The problem is that Poser has not evolved so it can handle the newest content provided by DAZ3D. The stores that continue to rely on Victoria 4 are fighting a losing battle.