Poser is all about props and textures made in other programs, so excluding such from the Poser gallery would completely empty that gallery if such were the rule. It would also make the Combined Applications one way too big for the groups.

I agree with soulhuntre in that I usually post in whatever I feel was dominant for that picture. I post in Poser mostly because really my work is mostly about the human side of art and so Poser is where all the emotion of people come from and so I use that. If it's scenic or the human is only a small part of the overall picture, then it goes in Bryce.