FYI, here are examples of waterproofing in cameras of significantly different price points:
Standard cheap $300 point & shoot (fittingly in Russian):
DSLR which currently retails for ~$1000 (and is dropping)
My slightly "last year" Pentax K20D DSLR has the same sort of sealing as the K7 in the image above and cost me about $600...remember the tech in an ereader is no more complicated that a can-opener meaning you can't point to the price...cameras cost tons more to produce.