Of course Apple wants to protect their revenue. But they focus their litigation efforts on companies that, in Apple's view, try to sell devices by making the look and feel imitate that of the ios. Microsoft also competes with the iPhone, but I doubt Apple will sue them as vigarous as Samsung, because Microsoft developed, again in Apple's view, an original take on the smartphone concept.
I think that is at the core of this issue: Apple feels Samsung copied the iPhone experience, without any effort or even vision on Samsung's side on how to create this experience. Blind copying so to say. So Apple wants to sue them on look and feel, but they can't; what I remember from the Microsoft-Apple litigation about look and feel is that it turned out that look and feel is almost impossible to patent and defend. That is my explanation on why Apple is now suing over their obvious patents, because they cannot sue over look and feel.
Why would the company be worth $600b? I haven't seen them do anything that I can't buy from another company cheaper, or in some cases, years before Apple "invented" it (ex: the iPad was a decade late to the tablet market).
I'm not trying to be snarky here, but what is it that Apple can actually sell me that no one else can?
To answer your question: a sturdy, forged aluminum computer with a powerful unix-like OS with the most polished interfaces around and the greatest collection of software of all systems? With a 200dpi+ display? With wireless, seamless, video/audio streaming to other devices? Bluetooth 4? The best multitouch trackpad? The only decent power cord on earth?
You're forgetting the impact this will have on it's stock, already reaching records highs since the decision was announced. So if you think it a "measly $1b" you're horribly mistaken. How about a "measly" tens of billions in overall stock growth over the next months?