I would often like more structure in the search results I see.
For example, I just searched Isle of Man coins by date. There are 49 coins first issued in 1988 and the listing keeps jumping between Pound coinage, Crown bullion, Noble bullion, and Angel bullion. A secondary sort of denomination would add structure to the results and make it much easier to look at the listing and understand what was present.
(If there is an existing secondary sort I don't know what it is. It's not Reference, Denomination, or Numista number.