I think in a lot of cases, the fraud is small enough that pursuing the offended actually costs the credit card more. But that is only PER transaction. If they actually added them up, well, they could remove full time fraud people from the pool and make out, overall.
But, I don't think credit cards think that way. I think they think, "You know what, it's easier to eat this." I mean the cost of pursuing and prosecuting a person for a 6 dollar purchase is prohibitive.
A lot of fraud employees KNOW this. They understand that it is better to keep their purchases under a certain amount, because they know the credit card company doesn't want to sit in small claims court and go over how they want their 6 bucks, or whatever. I mean, the penalties for fraud really don't offer much at that level of fraudulence. That's kind of the problem.
I always look at the "fraud department" as kind of.... a way to dissuade the credit card OWNER from like, putting in a claim (personally). I mean, they collect ALL this information and you just KNOW they will be doing absolutely nothing with it. Etc.
Anna