Just smile and nod... that's what I do...

Actually, I tell them, "Yes, I am a cheater. Please report me, and when you do report me, send me a mail in-game and let me know what the GM's response was." .. Followed by the /ignore.

Sometimes I won't ignore the player though, but rather I'll send them a message a week or so later like, "How did that reporting work out for you? I'm curious, because a GM hasn't talked to me yet."

I've never had anyone reply, nor have I ever talked to a GM :-)

One quick pull of my accounts, and a GM would see that a) all of the accounts are coming from the same IP address, b) the characters are fighting in sync, c) the name registered on the accounts is the same, and d) the credit card paying for the accounts is the same. No problems there.

Cheers mate.