"....unless they paid a registration fee."
And subsequently obtained your credit card details.
An FBI sting operation against an underground carding forum has resulted in 24 arrests. The Carder Profit forum had been run by undercover Feds for the last two years, yielding intelligence that resulted in arrests in eight countries. The sting - dubbed "Operation Card Shop" - began in June 2010 when the FBI itself set up the …
Brian Krebs had an interesting postscript to this...
http://krebsonsecurity.com/2012/06/carderprofit-forum-sting-nets-26-arrests/
Which subsequently led to him tweeting..
"I love when I put up a story about a carding forum and suddenly see lots of referral traffic from other carding forums."