How much theft occurs vis credit card ? Billions. And how much of it is ever reclaimed by the banks - very little.
All of it is recoved via chargebacks on the merchants. I guess you never had a merchant account

I did. And sold thousands of units of download software.
I realize I am talking to neophytes here who have no actual experience.
...card issuers bore a 63% share of fraudulent losses in 2012 and merchants assumed the other 37% of liability, according to the Nilson Report, August 2013.
At least get your facts correct.