I'm with you, Bunker. If someone says "email for pics," that sets off a red flag in my mind. Why? What do you have to hide, that you don't show pics with the post? Why do you want my email address?
It's like when you meet a "female" in a chat room, and immediately "she" wants to go talk privately, what's your Skype address?
The rare occasions that I've followed up on an "email for pics" ad, there never have been any pics forthcoming. I just take it as an indicator of "Not a serious offer, not worth my time responding."