Hmm. The only chance I get to read a book outside (i.e. not at home, in the office or what have you) is on public transport (on the way to/from work, or on the way to/from rehearsals).
Given that rush-hour trains are invariably packed to the rafters, I hardly ever get a chance to even open my bag, let alone produce a book. =\ So I don't think a Kindle will help, there. Also, obviously I won't be able to read while walking to/from the train station -- and the last thing I want is for someone to bump me on a moving train, causing me to drop the Kindle and have it smash.

Fixing electronic screens is very expensive -- I know that from experience, having twice smashed my mobile screen before I wised up and bought a leather case for it.
I could get a leather case for the Kindle, I suppose, but that would invalidate the point of having it because I couldn't see the screen.
Oh well ...