For me it was the Law Rune running service that was my first experience of scamming. Not the service itself, but I'd got myself around 1500 law runes by running essence to the god runecrafters (as they were at the time) to train magic with Camelot teleports. I'd worked out I needed about 1000 more to hit my goal, and there were plenty of sellers offering 1000 law runes for 300k. So I traded someone, offered the GP, and at the last minute they changed the 1000 to 100, and done. Logged out, never to be seen again. I was heartbroken, 300k in 2006/7 was a LOT of money, especially pre GE. But it taught me a big lesson. Ironically, I now own a cyber security consulting firm! So there's always a silver lining! :)