I havent used this scam in WOW - but it has been used elsewhere.
Basically we are playing a game of fantasy - so creative lying is the name of the game.
People hate grinding.
If you have a server with noobs on - you can tell them anything (sure the abailability of things like thottbot etc makes it easy for people to find out stuff - too easy in my opinion but a lot of players are lazy - or jsut plain dumb)
So this scam works on the lines of advertising an item for sale or something along th lines of "do you want double XP or a XP boost ?" Selling XP boost - if you want to level fast sont miss this chance " etc
When you get a nibble tell the player you have a special item (i have in the past said it is a bugged item) tyhat you wantying to sell for - some ridiculous amount eg 30000 gold .
This item when worn allows you to gain 5 times more XP per hour.
Do they want to buy it ?
They say no - i aint got 30000 gold (no surprise there eh ?)
So you say ah ok - who ias your guild leader - they tell you - you say ok - well i can let you hire the item for x amount of gold per day
you must give it back - if you dont ill tell your guild leader - and youll get kicked etc etc
Ok so the customer coughs up the cash - you trade them the diamond/sword/mechanical squirrel - whatever item u chose (helps if there are not 000s in the AH - even if you are telling them the item is strangely bugged !)
Obviously after about 3 minutes of levelling they come back on and say - it isnt working...
You ask where they are levelling .. thell em ... no no .. you cant level there u need to level on this mob in this province etc .. uyou dont know why but if def worksd there etc etc ...
next time they come back to you .. tell them that they will not see the double, triple etc experience becasue it only gets added after the server reboot - or in 24 hours - or even after they ahve returned the item to you (and if you cvan get away with it - paid you another 20g etc etc )
Hell ive had people on this for over 2 weeks - expecting to be max level in 5 days after the server reboot- in the mean time you are hiring your magic items out to a few other people etc efc..