The business aspects of Jackson's career are, perhaps, interesting and useful to this audience. For example, he acquired the publishing rights to much of the Beatles catalog at a bargain price in the 80's.
This was, obviously in hindsight (and probably at the time, as well), a very astute move, and the value of that catalog of music has only increased over time. Most of us would be very happy to have made business deals that put tens of million in our pocket, while still holding a share worth more than originally paid.
I don't know who Jon and Kate are, but Paris Hilton definitely is a PR hacker. Or if she is not, she is something even weirder, a self-feeding PR loop.
It's an interesting point, I'll bite. What did Michael Jackson do that was in the hacker spirit, as opposed to just being an immensely talented musician?