I honestly don't understand people putting their CC on PSN or XBox live. They sell PSN cards for a reason. It's way safer and you don't have to worry about your CC information.
Also, the people who are selling their PS3's are just idiots. The PS3 is not just an online system. It has tons of great games that can be played offline. I don't want to turn this into a whole PS3 vs. XBox debate. Both consoles have their pluses and minuses. I for one would never abandon the PS3 because it has too many exclusive games that I love. Games that XBox just can't match, IMO. Not to mention it plays Blu-rays.
XBox people can sit their and make fun of PS3 owners all they want. Xbox Live is not perfect either. They can be hacked just as easily. Also, XBox has their own problems with the whole Red Ring of Death. Every friend I have that owns an Xbox is on their 2nd or 3rd system. In some cases, they are on their 4th.
This is certainly a black eye for Sony. They are losing money in many different ways. The PlayStation store is pretty profitable for them. I think they should have been honest from the start and made people aware that the personal info might be in jeopardy. I think they will rebuild PSN and Sony will rebound. These things happen.