For me, a 66-year-old who's been reading voluminously for about 60 of those years, the value proposition of the Kindle (or probably just about any ereader, probably) is:

1. I don't have to store all the physical books I would have acquired over the decades.

2. I can carry around a large number of those beloved books with me at all times.

3. I can vary the font size, which my ageing eyes appreciate.