I do, however, own the books I pirate. The choice is pretty clear for me.
In the mean time, though, I do feel like I'm doing the "right thing".
Clearly there are already ways to remove the DRM, and the lifespan of a Kindle is decades so they will not easily be able to add new DRM to the old hardware.
In my opinion, it's roughly analogous to Steam but it moves at a glacial pace.
The revenue gained from those devices is likely greater than the revenue lost from people pirating content who would actually pay for it.
There are blu-ray players which support Amazon video and they can not be updated by Amazon.