From reading this forum, I get the feeling that the bulk of Poser users are hobbyists. I'll occasionally read about somebody doing commercial work, but people mostly seem to be using Poser for their own artistic expression. Poser provides a nice shortcut to realize fairly well rendered images without having to have great drawing skills. The best images will still be created by people who have inherent drawing abilities because drawing is more a mental talent/skill than one of hand dexterity. A good artist can create a better drawing with their less used hand (left for righties and right for lefties) than most people can. That's because drawing is about getting a mental vision onto a medium. There must be two different parts of the brain involved in the process because the mental vision doesn't translate as readily to a final product as copying from something seen with the eyes. The latter is much easier to do.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon