Listings For Sale on eBay

How do you determine what listings get listed in the Numista catalog under "for Sale on eBay"?

I have over 4,000 listings on eBay, but the only one of mine I have seen is the Bexar 1/2 real 1818.

When you are looking at a coin page, it tries to search for something similar. For search pages etc., it is either learning what you like based on your "searches" or it is just random.