I can see your reasoning as far as the narrator situation goes. When I first started reading "The Land Whore" it really threw me because I kept thinking "where!s JP? Stefan is a secondary character." Luckily I got used to it before "Be Rad."
And you're totally correct about the total injustice of rich people getting away with everything. It is the way the world works. Of course I've had twenty more years to get used to the idea, so it's easy for me to think that. Also I lived through the 80's as Mark did. Movies like "Wall Street" and TV shows like "Dynasty" and Dallas" not only let rich people get away with everything up to and including murder, they celebrated it.
That said it does seem that Will is getting away with lots of stuff. However, in those stories we are only seeing his point of view. Mark has said very little about what Brad, Robbie, Stefan, JP, etc were thinking at the time. It was all from Will's point of view. I'd like to think that in their minds they probably felt the same way many of the readers did, "why can't you just be a normal child for once in your life?" Mark also pointed out a few times that Brad wanted to stop whatever Will was doing but knew he couldn't, legally anyway, so he acquiesced. And he's starting to realize he was the same way at that age. What I would like to see in the future would be for Will to realize what he missed in his childhood and start regressing or at least stop moving forward. Sort of a passive rebellion, not the Katrina level reaction he's so loved for.