Turn OFFs

Spread-eagle penetration shows: Yes, I'd rather focus on your facial expressions, what you say (or moan, squeal, or scream), and whether your boobs are getting any attention. One exception explained later

Turn ONs

Making the Jump to Topless: Start with a model who declines to flash or go topless in public chat. If she says that she'll show off her boobs in group or private, I'm there. Then when she decides to share those tits in public chat, I'll do as much as my wallet can handle to make it happen.
Exception to the earlier turn-off: Find a model who steadfastly refuses to do penetration in public chat. When she reverses that policy, I want to be there for the big event. But one time is enough.

Shoulders Nice, full, round shoulders. Most underrated curves on a woman's body. Even nicer is that they often correlate to nice, full, round breasts. Aim the cam from the waist up and the view can be quite incredible even if it's just a bare shoulders and deep cleavage shot.

New Smokers Not a big fan of watching a woman smoke. BIG fan of learning when/how they started smoking. I turn to mush if someone I've known as a non-smoker starts to smoke. I lose it completely if she was actually more of an ANTI-smoker. Witnessing the transition as she becomes a nicotine addict is magical.

When a Model Says Hello Outside of Public Chat: Hey, what guy wouldn't want a little attention? It can be a PM when I log in, MFC mail message/reply, regular email message/reply, Skype chat request. Whether you do it as a camming business strategy or simply because you want to talk, it's likely to lead to tips.