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The story generally goes that it's to improve visibility of the keys in the dark. It's only 1 and 6 for the same reason only F and J have nubs on them on a desktop board - you use them to align your fingers and then you can picture in your head where the rest of the keys are. Aren't there two other circled keys on there too?

I wondered that myself...thanks!
Is there a way to power on the tablet from the keyboard? The lock key shuts it off or puts it on standby, but doesn't turn it on.
The trade off isn't worth it? As in having the ability to use the keyboard from stand by is not worth the unknown battery drain?