In your case, you may try some different sales tactics such as grouping similiar titles into discounted lots.
Also, as I told you before, your title bars need some serios work. You need to work on keywords and utilizing every available character in the title bar.
Remove the punctuation and add relevant words that buyers will search and that draw interest. Remove first edition, that is a useless keyword(s) as this factor should already be addressed in item specifics.
I also noted that most of your shipping charges are really low, this is good, but I may suggest that you build that small amount into the price somehow and offer free shipping which will boost your search rankings.
Also, providing the the full bibliographic details on your books is essential. People who buy Franklin, Easton, Folio, etc, want this info. Trust me, providing the basic, simple, bibliographic details will increase your sales by volumes.
Especially with your prices being near the high end of retail you need to really focus on building in perceived value through your listings. To build this value, offer the full bibliographic details, a full condition statement, relevant and interesting information regarding the author or title. Tell people why they should buy your book and not one of the other 1,000 sellers offerings.
If you call a book rare or scarce, back that info up with pertinent sales records (current or past), or bibliographic citations when available.
Again, you have to strive to set yourself apart from 99% of other ebay sellers either by sales tactic and research or by lower price. Your choice really. Whether you realize it or not----the market share you are after selling Folio Society is extremely competitive and average, run of the mill listings are not going to get you where you want to be.
Anyway, let me know if you need help.