This is why I prefer a model that allows me to read as many formats as possible. There is already a huge online library of public domain books in plain text format that should be perfectly readable with a good reader.
I'd gladly pay less for a digital copy of the new books I currently buy, but at any given time I'm reading a number of books in print that I bought second-hand which are also available freely in an electronic format because their copyright terms are long expired (and when I'm on the road I often read them on my notebook instead of lugging the books with me).
Then again, I think most of my desire for a good electronic book reader comes from having moved several times in the last few years and having a box or two of books destroyed when my garage flooded a few years ago (and no, it wasn't me that left the books in the garage, I wasn't in town for the move). Moving books is a pain, and good book shelves are expensive (and also a pain to move).