Are appendices and pure lore chapters appreciated on RR?

Many novels have magic or history related appendices at the end of the book. This extra content adds some context to the setting and helps confused readers understand in-world concepts. They're purely optional and are not in any way a replacement for good writing.

I'm adding such files to my work, but I'm not sure if people find them enjoyable or even useful. Do you as a reader appreciate them? If you're an author and have included such installments, what feedback did you get on them? What advice can you provide?

Here's a link to one of my chapters as an example: Magic Addendum I - The Lapidarium of Troqua