I have noticed that drawn has downloaded content from Posersoftware.com in one of his screenshots.  You can have different logins and passwords for Posersoftware.com and Renderosity.com.  I do not know if purchasing from one site automatically transfers the information to the next site; I assume it does not.  However, with my Poser 13 app Renderosity login, I can still download content from Posersoftware.com without switching accounts.