No, I think we appreciate your point in the sense that people will want cheaper stuff, more conveniently. Of course.
I was merely disputing that it's only down to how 'good' a shop is vis a vis its survival. In my eyes for music/books et al Tescos is atrocious, but it's 'good' at being successful overall, and that's what squeezes out the 'good' shops - not a matter of quality and variety all round, but a comprehensive nuclear demolition of competition via pressure and money.
In any case I don't really understand your argument as it applies to books. Whether or not a shop owner cares about what they sell doesn't seem to me to matter very much if they have the book I want in stock. I buy the book, take it home and read it. I don't hang about chatting to the shop owner about how great it is. Why does it matter whether you buy a book from someone who knows about books or from Tesco, if it's the same book?
I'm unaware of any purely economic reasoning about this, so I'll just argue it as a matter of taste. I prefer it, because I get the impression the person I'm buying from actually gives a fuck about the book, and consequently is like minded. I enjoy that.