It's not eBay, it's Hong-Kong and China.
"copper earrings" yields 6255 listings (= 250 pages or 25 items / page), 1509 auctions, approx 1.5hr on the first page. Looking at first seller, the person from USA has 8767 live listings, all auctions (auctions do not follow Best Match, but they are always shown in Ending-First even when Best Match is selected) evenly spread in 7 days - one auction ends approx. every minute and few seconds.
This is some heavy duty marketing, this person pays $2600 a week in listing fees only. This person is also seriously flooding - "BLUE TOPAZ .925 SILVER RING" search titles only gains 137 items in her store. You cannot miss this person.
WesternStarGifts - 982 listings, 61x 7-day auction. if you want to always be on the first page of "copper ring" search, you need 16 auctions with words "copper ring" ending every day spaced evenly in time.
You are in extremely competitive niche and unfortunately some sellers are flooding the keywords. It works for them, you should start doing the same of struggle.