Hi, I took a look at your adapter listings and had some thoughts. First let me say you have done a thorough and capable job of listing your items. I am especially impressed with the depth of your knowledge of the AC adapters, and you have strong description content that will undoubtedly convince shoppers to select yours to buy. If they could find your listing.
Unbranded, or unknown brand, items often have difficulty being sold or established on eBay. That's because of the lack of a primary keyword that many shoppers use to locate items. If I do a search for AC adapters on eBay, using these keywords "AC Adapter For Boss RC-2," 44 items are shown. Out of those, yours by far is the most expensive in the group. The others start at $4.69 with $3 shipping, and yours is listed for $24.77 with $7.75 shipping. Although yours is a higher quality, works with more gear, has the best warranty, etc., you are at a serious disadvantage when many shoppers will filter by price, placing your listing dead last in the field.
If I broaden my search to simply "AC Adapter for Boss," 2915 AC adapters are returned in Search. Yours is buried under hundreds of others. Unless you are going to do Promoted Listings, it will be difficult for buyers to find you. Since all these listings look alike --all black units and nearly identical stock photos, there is just no way to distinguish your listings from the dearth of other choices. In such a situation, most shoppers will start with price.
I've been selling here successfully for 10 years, but my items are a combination of unique, rare, scarce, popular, vintage, high demand, collectible, or niche. (My prices are set very attractively to encourage the sale, and terms are buyer-friendly.) But on eBay, it comes down to offering something the buyers can't get elsewhere, with identifiable keywords that most shoppers will look for. I am curious how you came to select this particular item for sale. Is there a need you have identified that is unfulfilled, leading you to choose this product?
You have defined your customer specifically (guitar musicians needing pedal and processor effects), so you know who your target market is. Thus the important question becomes: Is eBay the best choice to reach them?
If you could just get the clicks on your listing, the item could practically sell itself. But you must distinguish your listings from all the others to encourage that click. It's not going to be the photograph, all those adapters look alike. You are already following eBay's best practices (buyer friendly returns, clear terms, good pics, etc.). So you might consider Promoted Listings to get your listing out in front of everyone else's. Your titles also need a bit of tweaking. Take out all of the punctuation, it interferes with SEO, and bone up on Search Engine Optimization to encourage Google and Bing etc to publish your listings on their platforms.
Others will come along with more ideas on how to help you. Good luck and wish you much success with your efforts.
