No, this is not for marketing purposes because for marketing purposes it is useless.
I work in a small bookshop. Please stop here and feel that calm feeling of being introduced to a topic you already have some idea about, even if you have only ever been on the buying end of the business. This is your chance to ask yourself what expectations that intangible knowledge provides you - are there any particular things you think would "have weight", if your bookshop experience was a thousand times more, eh, experienced? (It's a nice round number, let's roll with it.) By "things having weight" I mean smth like "you still notice it after all this time" (1) and/or "you built a heuristic around it" (2) and/or "you observe it and know it to be the common way of things" (3) and/or "you know something for a convention that can, if need arises, be cast aside" (4) and/or "you seek it out as your clue for a specific action" (5).
And what do you think about what other people's answers would look like?
...And what do you think a bookseller's answers would look like?
(The broader question is (PLEASE read only after you have thought about the specific one) hfvat jung pbaprcgf jbhyq lbh qrfpevor lbhe nccebnpu gb ercrngrq bofreingvba naq npgvba va fbzr snveyl arhgeny, pbzzba frggvat, juvpu qbrfa'g checbfrshyyl ahqtr lbh gb ersvar lbhe fgengrtvrf (cebonoyl), hayvxr gur tnzrf jurer lbh zvtug abg xabj jung'f tbvat ba ohg lbh qb xabj lbh'er rvgure YBFVAT be JVAAVAT. Ohg V qvqa'g guvax vg'f gvzr gb nfx gung dhrfgvba lrg.)