[SilverBirch]

Physical bookstores are on the complete other end of the Signal:Noise ratio spectrum, you've got such an enormous cost of publishing that even quality isn't enough (and this is the old problem of book publishing) you won't get a physical book produced unless (a) you have a track record, (b) you publish it yourself or )c) you're a celebrity who is using their celebrity to sell books or (d) you're great and you sign a usurious deal with a book publisher.

In the same way that the noise floor is becoming too high for eBooks, the quality threshold is too high for real books - (d) basically doesn't happen because you have to be so great and sign such a bad deal. Not least because publishers have consolidated into an effective monopoly.