Actually should not be that worried about promotion of new Poser releases here. Users of Poser can't miss it due the lack of new stuff, things remain on the first page for almost one month for 60 releases. New releases stay on top for almost 2 weeks in the poser section ! this makes it for sure visible without any add :)  If you are on RH then a new release will be already on the second page after day, with 100 releases a day there you might have to say something good needs to be promoted :) 

Renderosity probably has other promotional issues then a new doll if it stays on top for a month  ....