Because under logical circumstances, if a player needs to blacklist 200 people in a video game, then they may as well quit playing cuz everyone hates them anyways.

But along came gil sellers and logic and reasoning went out the window.

But on a serious note, from my impression, PS3 has been the limiting factor when it comes to data storage currently. PS3 is not a console meant to handle large MMOs if a developer has to be put this much care into preserving every last kilobyte of data. Hence why they hosted that upgrade to PS4 compain and are going to end support for the PS3 which will free up vast amounts of data storage thankfully.