PSN was hacked not via a PS3, but a PC emulating a PS3 from what I read. PS3 hash being leaked had nothing to do with that. Sony just sucked at protocol encryption.
There's hackers who hack because they don't like the way a product functions, and there's hackers who hack to steal. Know the difference.
Besides... who uses non disposable credit card accounts with no overdraw or low limits on the internet these days? What are you 50 and technologically illiterate?