Drop rate of Kobolds

After briefly looking at the Monster Database for drop rates of items and the Crafting pages, I came to the realisation that Kobolds by far drop the most useful components - that being metal ingots. They even have a chance to drop some leather. After that, Canines are pretty good for dropping leather, the rest of the material needed for crafting equipment. Is this working as intended? I'm concerned that this will mean most people will only be interested in fighting Kobolds and Canines, though admittedly a few others will need things like silk from other creatures.

Thank you for answering my query!