Several developers claim that the PS3 is a more open platform for things such as MMORPGS and additional services over PSN, look at Valve with Steamworks and Portal 2 PS3-PC cross platform features, don't destroy what we have achieved!, Sony is taking a lot of good steps towards the right direction (obviously as a marketing decision to regain the throne) while MS have prevented some MMORPGs and other services to be implemented on the 360, just because they don't want to lose an inch of ground. If we all go and say ' Fuck PSN, I won't use it again' Microsoft will take advantage and do whatever they want, they have already went from a paid service to increasing the fees instead of going towards a 'free' direction.

PSN being hacked is obviously bad, really bad, it should have never happened, but that doesn't mean that they didn't invest enough in security, you can be pretty sure that a big chunk of the income from the service ends up in security improvements and maintenance costs, hiring companies to do ethical hacking to test the systems and expert security audits, what happened is really a bad message to potential customers and will cost Sony several times more than what some people may think they 'saved' without investing (but they did invest)

So, don't stop buying things on PSN in the future, maybe you can get some prepaid cards for some time so you can be sure that more improvements are already implemented on the system for you to bind a credit card again, no system is perfect, you can go bananas an run millions of tests, simulations and have the best people under your roof but that only makes the possibility of being hacked tend to 0, but you can't reach 0, never.