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The "sold items gallery" would not be redirected and if this gallery was filled with photos of attractive photos and descriptions of the most interesting items that you have sold it could attract links, traffic, likes, tweets and more.  I know of some antique dealers that have huge "sold item galleries" that attract a lot of traffic from interested people.

In Wordpress you don't have catalogues except e.g. catalogues on servr like "/wp-content/uploads/....",  only posts. Some type of specific posts functions as pages. A little bit different is with pages which are created by dynamic query like tag, category, archives. But in the end they are also posts with one specific url. I'm linking with "/" but google indexed pages reported to index with or without "/" on the same way.

Creating 301 to non-existing products is easy (technically speaking) - are you sure that it not considered a bad thing by Google? (pages keep being removed). Thanks again

Dear Cyrus, I completely agree that there is no good and added value with the stock id and measurements for Google but I felt like I had no choice. I didn't want to start putting canonical between the pages because every other day an item is sold and then I would need to change the canonical to a similar existing item. Are you saying that when a page makes a canonical to himself Google does not index it? Or treats it as a non original page (a copied page) even if I don't specify from where it is copied? Please see the following question I asked that is about this matter and got a different response:  http://www.seomoz.org/q/is-there-a-reason-to-put-a-canonical-to-yourself-interesting-case Thanks

I, too, work with a site that has many (thousands) of product pages and dozens of categories. Over time, the homepage did get the most links and it ranks for the brand - which is fine. What's better for the user is that the category or product pages rank for specific keywords. I mean, for the best user experience, I don't want someone to have to go to the homepage and navigate down a few layers to get to what they want. Links to those deeper pages have helped make them more visible. The more pages that rank for the right keywords = more online real estate and more ways for the audience to find you. So, it depends on your strategy and preference - and - is it better for the user to go to the homepage or to the product page? And, what's the reason those two would compete against each other for keywords (if that's the case). All the links into the site will eventually help the domain authority.

Dear Egol, I'm assuming by your answer that PDF's take link juice and JPG's don't (please correct me if I'm wrong). Is that the case even if I have <a href="">to enlarge the image? (I use href with JQuery and not regular target=_blank)</a> <a href="">Also, what to do about the certificates that are on other sites? (too many and rapidly changing for me to get it to my site)</a>