Lee,

I did very well upselling dvds and vod from my video section. I found a company that paid 30% commission on DVD sales and put the same dvds on my vod theater.

With pictures, you can look at it from two points of view -

1. They are still images and may appeal to those who like a "physical" product
2. They are niche related

Case one, maybe upsell to a site like TLA. Or if it's uncut, link to an uncut dildo.
Case two, send to more of that niche. Go wild try VOD or toys or whatever.

I really feel it's more about the niche than if it's video or images. How cool would it be if someone designed a CMS that allowed you to run small targeted ads that linked to a physical product in an online store based on keywords at the bottom of gallery pages.

BTW, the best way to sell a product in a member's area is via a blog. Seriously. It works.

Lloyd