I'm sure it depends upon a variety of factors. Location being one of them. Everytime I read one of these, it always seems to be SoCal, AZ, or FL.
Kids in groups are always going to fare better. Also, you would think that if this had happened as many times as they say, they'd have been able to pick off some surveillance from mall cameras or something in attempting to prevent further instances of solicitation.
This is the FBI's top investigator on human trafficking and his report. Please do not dismiss this problem. It's a problem and being exacerbated by the ease of internet porn and other vices.