You know what, I ignore posts like this, but I'll answer you because maybe someone should make it sticky or something to stop the same from being posted time and again.
The reason why nothing of real value is made public, or that the real hacking is done in private, is to do with the huge amount of wankers and wannabe's who throw around the collective "we" - yet do nothing of note themselves.
I won't mention names, but there are enough pretenders out there who sit on their asses and then publish others "work in progress" in order to get their e-***** extensions and/or hits to their websites.
Pray tell, what can you do to assist? What skill can you (and anyone else who has the same questions as you in future) actually bring to the table?
If you counted on your hands the amount of real hackers who have done the real work (and I am also talking on X360 and Wii here) you would have less than 10 people. Everyone else is a hanger on stealing oxygen and wasting bandwidth.
So there you have it, the reason no one publishes anything of any real value is simply that putting that information out there does nothing more than bring the efforts of the few who wish to remain silent to light, in order to promote the interests of the wannabe's and flag the potential exploits to SCE.
If you want to be part of the "we" you so casually throw around - then bloody well get off your butt and do something about it, instead of posting some bs asking why no one will give you their hard earned work on a plate.