I've been on the verge of doing this same thing.
I have no interest in games (well, ps3 games), but want it for homebrew, and REALLY want to see xbmc on it, or some other media player that is better than the stock dashboard, which I don't think should be too difficult to do, as the stock dashboard sucks. Sadly, I've learned that no one seems to want to even attempt to port xbmc over to the ps3, so now I'm not sure what to do with my machine. All I wanted was a media center that can push HD tv, unlike my xbox 1.
the other main thing that is keeping me from jailbreaking mine, is that I'd like to sign up for streaming netflix, but I think you have to go through sony's services/site to get there, and I'm afraid of signing up and then getting blacklisted. Anyone done such a thing?