Yes I have encountered these people many times so much so that about a week ago when i received a random pm from a new user I didn't even respond to it because i know their tactics so well. It always begins with them randomly pm you and they have either no posts at all or very few they use sweet lovingly words in their speech like more than what is normal for even the most loving person they also will after talking with you for a while want to talk to you via email and if you do refuse to do so they get upset.
Most likely they know that the mods can read pm'ing and so they want to talk in a more (secure) way and then give you a very moving sob story and asking for money promising a butt load of money in return but you need to give them your info. I have brain damage and I have had to be in special ed all my life and even I know not to give your info out especially online