The catalogs are very high quality but I prefer my digital collection since it can be sorted in unlimited ways (decade, genre, country, rating (the infamous "five star" rating system in iPhoto), etc.).
After you sell or give away your catalogs, your team should organize a master digital collection of your prior sales and put together some digital Kindle books in various categories (1920s classic posters etc.) and sell them. As far as I understand, virtually all pre-1964 movie paper is in the public domain, so there are no rights issues.
I currently have 700 high-quality/unwatermarked/x-large images of "exceptional pre-1960 posters." Of course, many of them individually - let alone in total - are far beyond my budget, so digital is the "next best thing":