Gang points should just be a meter for gang activity. You shouldn't be able to lose points because all that does is discourage defending.
I also agree with perks for being a top sparrer. I had actually planned to do this, but never got around to it
The problem is that there is just nothing to do in general. There's no point, and I don't think simply adding pking bonuses (like giving ECs or whatever) will really solve anything. I had the most fun back when parties would get together to try to defend the "money block". That, in my opinion, was
real purpose for pking.