See, now here is where I always differ from the generically assumed interpretation.
In the context of the chart (and the feat - IC) I've always thought of "special powers" as not "personal abilities", but rather along the lines of "influence". Catch my drift?
To me anyway, when I read it, I see someone who has command or clout as qualifying for that bonus. So a king or magister are easy example. But also: town marshals, leaders of the thieves guild, heads of the mage's guild, knights (law enforcement types), church heirarchy, etc.
The reason I've always thought of it this way is because the whole chart is based around reputation. And having influence or command over something/others is good for that. Not necessarily just because someone can cast a spell in a world where lots of people can do the same thing. Having a title of some kind can carry a lot of weight, IMO. That is the purpose of the bonus.
But I guess that's just me. Odd. I never even saw it the other way until I ran into a few people who did and we got into a debate about it.