Talk:Ingot/@comment-31124876-20170123052606/@comment-3045005-20191206151654

Most likely because taking several rolls added together produces a bell curve with greater likelihood of results toward the middle, and rarer results on each end. Developers could place common items in the middle and items they wanted to be a rarer and valuable surprise at either end of the table.

https://anydice.com/program/1b94