Actually, the battery will cost exactly the same amount as any user-replaceable battery--$129. Apple will likely offer (like they do with the iPod, iPhone, and 17" MBP) a battery replacement program that only charges the cost of the battery. They will have to take it away from you for 24 hours, but they certainly aren't getting more money from the new setup. Just setting facts straight.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
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