A few weeks ago someone asked for any analysis of sales by alphabet ie. Do "A" countries sell more than "B" countries. Initially I didn't see and value in such an analysis but then I thought of how often I see collections for "A-C" or "M-S" listed in auction catalogs and I realized I could use this information if I had it.
I have a large database of my
ebay sales since 2014 and without too much trouble I was able to analyze the sales from over 60 collections that I broke down into 16,000+ items. The analysis is presented below;

The letter "U" has the highest average $ sales because it includes the US and I've sold some high priced US collections from Scott International albums, "J" is high because I had a couple expensive Japan items. The rest seems to be what I would expect.