I've written a lot about this. Steem Power is a measure of platform trust and currently the only way to gain trust is to invest in the platform.
This was a good idea to get Steem going, but it's already outdated itself. We need to employ smarter metrics of trust. You should only get Steem Power when you interact positively with the blockchain and you should lose it for negative encounters.
I've made a lot of suggestions like having trials-by-jury and things like that but I suppose I'll have to become a much bigger player in the community before I'm taken seriously.