Craig, take this for what it is worth, likely not much. This is my skewed view of the world and the Trade.
Collectors want to know they are buying from someone who has the ability to put together a coherent listing with properly identified details.This is an indication of service standards and knowledge of the product.
rubric, full title, author, publisher, copyright date (or any date present), physical description, collation, full condition statement, etc are all very important as you know.
In my personal opinion, a buyer wants every piece of information that a seller can muster the energy to provide and is entitled to it. So, even providing a lowly copyright date can go a long way to providing that comfort to the buyer that:
A) you have actually opened the book
B) you have some idea of the standard practices in the book trade and are thus able to give a proper condition statement (which I agree is a most important factor within this category of product)
You could argue that buyers of Easton Press do not need to know that the endpapers are silk moiré, or with bindings of leather accented with 22kt gold, or how many pages the books has or if its illustrated or the actual physical size of the book---that they should know. Well, some people do not know, some people do not understand that Easton Press (and others) were issued often and with many variants. Customers may not know that often the variants can be understood and differentiated by binding as well as by the physical size. Maybe the difference in a customer choosing you over the other 1,000,001 people who sell Easton, Franklin,Folio, etc, is that you have gone out of your way to provide a proper, and full catalogue entry.
Just because they are buying known books and the margins are low does not mean that we should not afford them the same cataloging services as provided elsewhere, even if it seems (or is) an empty exercise.
Regards,
Michael.
****My original remarks were given to someone that needs to learn the proper way to catalogue books. Whether they sell a Folio or two is not of importance, but rather, that we have armed that person with the knowledge to be a better book dealer.
p.s.----Love the website------I check it out nearly everyday!!! You sir, are a valued piece of this community and I for one wish to thank you for your efforts.