Been involved with selling poser content for nearly 10 years, I can safely say one thing that way. You ain't get gonna rich. That said if you run it as a second job/business, you can make a few quid from doing it if you make the right things and diversify. For poser content, if you don't want to make slutwear or hair, biggest sellers will be buildings/sets and real world everyday vehicles. By diversification, forget t-shirts and sites like zazzle. Waste of time. Get out there and talk to small business. Use poser/renders on anything from photo manipulations, magazines, leaflets, web designs. Basically anything you can print on. For example, this image shows some ContraVision, aka vehicle wrap. At around 1/2 metre square, it's the smaller of two images. Which will be used to give the appearance theres a dinosaur behind a wall.

Pinky - you left the lens cap of your mind on again.