This scam is just mixing parts of other scams to make a believable good one.
I have tried this scam 6 times and worked each time.
You should start by finding a moron/noob 70 character in game.
/w the player and say something like "Hey! i saw you with my main the other day. I didn't check your gear so i had a look on the armory. You've got nice stats (and if their gear is good, tell them its good)."
You should recieve a reply like "hehe thnx

"
You then ask..."May i ask what your player rating is???"
Obviously we know that there is no such thing as a 'player rating'
You might get a response like "What is that?" or "do you mean arena rating??"
Say, "Ok, a player rating is basically this cool thing that gives you a server rank and tells you how many deaths, mob kills, honorable kills...damage,gold etc...you have ever had and done

"
Ask them if they want to know how to do it. They should say "yes plz!"
Now, you really have to make this bit believable. Say to them..."ok you're going to need to make a series of macros to activate it.
Make it believable. These are the ones i usually use.
"Make a macro called '
PR.(theirnamehere)' , in this macro type this: PLAYERRATING.system-eulogon.(therealmyouron)
They say "ok, now wat?"
Say, "ok now make this next macro....call it WoW.
PR.....type this in the macro: (theirplayername)-worldofwarcraftplayerratinglogin.txt"
Then say, "ok this is the final macro which enable you to login to Blizzard's player rating system. Call it Login. In the macro type: '/dnd account name: (youraccountname) account password: (youraccountpassword) character's name: (character'snamehere)"
They say "ok now wat??"
You say, "right now click each of those macros to activate your player rating."
So just like that they click them, and after the last one, they become /dnd with their account name and password staring you right in the face
Have fun and plz do not over use it