I second your reaction.
Many times I either asked via a sms or email message to verify the picture in the add is real, and if not, send me a recent picture... 99% of the time, I get either no response, or a response fessing up it is not a real picture..
If I get a response, there is no picture, and when I ask for one, most time not another response,, or if I get one, not anywhere near the same girl...
bottom line,
you need to see them, then make a choice..
or if not, late at night, that thing between your legs will most likely make an unwise decision...