Put 2 and 2 together as to why the site is invite-only.
There is an extremely high risk of banning, profile suspension, and/or gamerscore zeroing associated with any type of gamesave usage/modification.
Just because things can be done, doesn't always mean they should.
Just to further that thought -- under the circumstances, what you might see as self-centered or selfish, is often in fact responsibility. Not just with respect to 360, but in most realms, anyone with any type of knowledge or facilities to accomplish something that may put others at risk, is put into a unique situation of having to make a decision as to whether that information is ever put public. No matter how many people want it or how cool it is, it's up to no one but the possessor of that knowledge what's done with it. I think it's very respectable in such a case when a decision is made that's quite evidently for the "greater good".