There was some discussion about that in el Reg's comments section after their article on the subject. Pretty much, people were asking what stopped malicious persons from sending the honey pot link out to others under false pretences.
They could even hide it behind a tiny url or similar, so the victim wouldn't know what they were clicking until it was too late, and then the FBI put their door off its hinges. Not to mention of someone was piggy-backing their wifi connection
I'd be thinking that most people wouldn't sign up to a CP site just because they where sent a ink :/