An attacker might potentially be able to get at your card details, since you need to enter them in order to buy stuff on the PS Store. Also, the PS4 has social

An attacker might potentially be able to get at your card details, since you need to enter them in order to buy stuff on the PS Store. Also, the PS4 has social media integration, so it might be possible to access your accounts somehow. (I'm not saying that an attacker definitely can do this; I'm merely pointing out that there are potentially some bits of private information on the PS4.)