By ensuring that shareholders are delighted, he makes sure that the show is lubricated with enough cash; so that they're able to ensure even more daring stunts and fireworks are available for the next season's performances.
I think it's wrong to assume that Apple are perfect. In my opinion, there are many things that could be improved about their products, but Jobs realises that perception is _everything_ and he's worked hard to ensure that Apple's image is carefully crafted and actually fulfils emotional needs that Apple's customers have grown to appreciate - and would gravely miss if Apple wasn't around.
The amount of vitriol that's produced by Apple's advocates (when the parent company is attacked) consistently amazes me.
Watching the show from the cheap seats, I'm reminded how every business action can serve multiple aims. Every (slightly or even, overtly) nefarious action can be teamed with a more egalitarian or idealistic aim; each of which can be used by advocates to fight Apple's corner. It's supremely clever work.
I'm not sure if a corporation which operates such a cunning, clever operation should necessarily be congratulated every time they release results. When smoke and mirrors are involved, I think it's worth trying to preserve some critical judgement.