I'm getting into the bigger part of the dark brotherhood objectives now, the ones where they give me optional objectives that come with an additional bonus reward if I choose to complete the optional stuff. My question is whether or not any of these are worth doing this time around? I remember in Oblivion (don't quote me on it, just what I remember) that 90% of the bonus objective rewards were just some extra cash or junk that I never used. Obviously if they aren't much of a challenge to do, or aren't out of my way too much I'll definitely do it. But if I'm going to have to bust my ass to do some tedious bonus objective just for a few extra coins I'd like to know up front.
So are the bonus rewards something that's worth doing this time around? Do I get anything really good for doing them? or are they pretty much all skippable?