You might be surprised how little many companies actually care about security when the fallout is largely externalised (for example users having their gmail compromised because they used the same password for linkedin).

The real question from linkedin's point of view is how many profitable people stopped using the service because they stored the passwords in MD5?

Based on some of the systems I have seen over the years I will say that there is a very strong chance that some company you have bought something from at some point has a copy of your credit card number + CCV2 stored in plaintext in a mysql database somewhere.