I was buying 2m junk off of "oi 2h oi" he/she was not willing to go first so I offered to go first with 50/50 so 1m at a time. I bought the first 1m and he/she logged off of Runescape and MSN. They came back onto MSN to tell me they wouldn't be paying. You can see that I bought the junk from the two screenshot and you can also see that they logged out of Runescape on the minimap as soon as the trade was completed. Here are the screens.
